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Mackinaw Mine, Monte Cristo Mining District, Snohomish County, Washington, USA i
Regional Level Types
Mackinaw Mine Mine
Monte Cristo Mining District Occurrence
Snohomish County County
Washington State
USA Country

Regional Level Types
Mackinaw Mine	Mine
Monte Cristo Mining District	Occurrence
Snohomish County	County
Washington	State
USA	Country

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Adit

Mackinaw Mine, Monte Cristo Mining District, Snohomish County, Washington, USA

View of the mine site

Mackinaw Mine, Monte Cristo Mining District, Snohomish County, Washington, USA

Erythrite

Mackinaw Mine, Monte Cristo Mining District, Snohomish County, Washington, USA

Adit

Mackinaw Mine, Monte Cristo Mining District, Snohomish County, Washington, USA

View of the mine site

Mackinaw Mine, Monte Cristo Mining District, Snohomish County, Washington, USA

Erythrite

Mackinaw Mine, Monte Cristo Mining District, Snohomish County, Washington, USA

Adit

Mackinaw Mine, Monte Cristo Mining District, Snohomish County, Washington, USA

View of the mine site

Mackinaw Mine, Monte Cristo Mining District, Snohomish County, Washington, USA

Latitude & Longitude (WGS84):

47° 58' 53'' North , 121° 26' 30'' West

Latitude & Longitude (decimal):

Type:

Köppen climate type:

Csb : Warm-summer Mediterranean climate

Nearest Settlements:

Place	Population	Distance
Index	194 (2017)	19.8km
May Creek	818 (2011)	21.9km
Baring	220 (2011)	23.4km
Gold Bar	2,112 (2017)	23.5km
Startup	676 (2011)	25.6km

Nearest Clubs:
Local clubs are the best way to get access to collecting localities

Club	Location	Distance
Darrington Rock & Gem Club	Darrington, Washington	33km

Mindat Locality ID:

17282

Long-form identifier:

mindat:1:2:17282:3

GUID (UUID V4):

Other/historical names associated with this locality:

Weden Mine; Weden Creek Mine

A copper-nickel-cobalt mine located on the west fork of Weden Creek. It worked a mineralized fracture zone that can be traced for 3,000 ft (ca. 914 m) on the surface and has a known depth of 125 ft (ca. 38 m). The orebody is from 11 ft (3.35 m) to 30 ft (ca. 9 m), with a known length of 90 ft (ca. 27 m). Developments include 5 adits and an open cut. It produced a small amount of ore from 1900-1910. There was sporadic development later on, but very little later production.

Deposit: The deposits were developed from 1900 to 1910 in a search for gold ore. Only a few tons of ore were ever shipped to the smelter. The ore deposits are in a peridotite dike or intrusive that is interspersed with small blebs and seams of serpentine, actinolite and tremolite. At several places in the mass, small deposits of nickel and copper sulfides occur. The peridotite in which the principal ore deposits occur is a dense, dark-coloured, fine-grained rock that has been partly serpentinized. The principal ore deposits occur along a shear zone that strikes N32°W and dips nearly vertically. Cobalt assays about 0.05 per cent.

Geology: Most of the nickel in the ore is combined with arsenic in the form of unidentified arsenides.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.

Mineral List

30 valid minerals. 1 (TL) - type locality of valid minerals.

Rock Types Recorded

Select Rock List Type

Alphabetical List Tree Diagram

ⓘ Peridotite

ⓘ Serpentinite

Detailed Mineral List:

ⓘ Actinolite

Formula: ◻Ca₂(Mg_4.5-2.5Fe_0.5-2.5)Si₈O₂₂(OH)₂

References:

Milton, C., & Milton, D. J. (1958). Nickel-gold ore of the Mackinaw mine, Snohomish County, Washington. Economic Geology, 53(4), 426-447.

ⓘ Annabergite

Formula: Ni₃(AsO₄)₂ · 8H₂O

Habit: coatings

Colour: light green

References:

Milton, C., & Milton, D. J. (1958). Nickel-gold ore of the Mackinaw mine, Snohomish County, Washington. Economic Geology, 53(4), 426-447.

Cannon, Bart (1975) Minerals of Washington. Cordilleran. 184 pp.pages 45,72

ⓘ Arsenopyrite

Formula: FeAsS

References:

Cannon, Bart (1975) Minerals of Washington. Cordilleran. 184 pp.p.45

ⓘ Calcite

Formula: CaCO₃

References:

Derkey, Robert E., Joseph, Nancy L., Lasmanis, Raymond (1990, November) Metal Mines of Washington - Preliminary Report. Open File Report 90-18. Washington Division of Geology and Earth Resources

(2005) Mineral Resources Data System (MRDS), US Geological Survey.

ⓘ Chalcocite

Formula: Cu₂S

References:

Milton, C., & Milton, D. J. (1958). Nickel-gold ore of the Mackinaw mine, Snohomish County, Washington. Economic Geology, 53(4), 426-447.

ⓘ Chalcopyrite

Formula: CuFeS₂

References:

Milton, C., & Milton, D. J. (1958). Nickel-gold ore of the Mackinaw mine, Snohomish County, Washington. Economic Geology, 53(4), 426-447.

Valentine, Grant M., Huntting, Marshall T. (1960) Part II - Metallic Minerals, in Inventory of Washington Minerals. Vol II. Bulletin 37, Washington Geological Survey.

Cannon, Bart (1975) Minerals of Washington. Cordilleran. 184 pp.p.72

(2005) Mineral Resources Data System (MRDS), US Geological Survey.

ⓘ Chrysocolla

Formula: Cu_2-xAl_x(H_2-xSi₂O₅)(OH)₄ · nH₂O, x < 1

References:

Valentine, Grant M., Huntting, Marshall T. (1960) Part II - Metallic Minerals, in Inventory of Washington Minerals. Vol II. Bulletin 37, Washington Geological Survey.

(2005) Mineral Resources Data System (MRDS), US Geological Survey.

ⓘ Covellite

Formula: CuS

References:

Milton, C., & Milton, D. J. (1958). Nickel-gold ore of the Mackinaw mine, Snohomish County, Washington. Economic Geology, 53(4), 426-447.

ⓘ Cubanite

Formula: CuFe₂S₃

References:

Milton, C., & Milton, D. J. (1958). Nickel-gold ore of the Mackinaw mine, Snohomish County, Washington. Economic Geology, 53(4), 426-447.

Valentine, Grant M., Huntting, Marshall T. (1960) Part II - Metallic Minerals, in Inventory of Washington Minerals. Vol II. Bulletin 37, Washington Geological Survey.

Cannon, Bart (1975) Minerals of Washington. Cordilleran. 184 pp.

ⓘ Erythrite

Formula: Co₃(AsO₄)₂ · 8H₂O

Habit: crusts

Colour: pink

References:

Milton, C., & Milton, D. J. (1958). Nickel-gold ore of the Mackinaw mine, Snohomish County, Washington. Economic Geology, 53(4), 426-447.

Valentine, Grant M., Huntting, Marshall T. (1960) Part II - Metallic Minerals, in Inventory of Washington Minerals. Vol II. Bulletin 37, Washington Geological Survey.

Cannon, Bart (1975) Minerals of Washington. Cordilleran. 184 pp.pages 72,88

(2005) Mineral Resources Data System (MRDS), US Geological Survey.

ⓘ Forsterite

Formula: Mg₂(SiO₄)

References:

John Lindell specimen, Bart Cannon analysis.Identified by Alfredo Petrov: SEM-EDS

ⓘ 'Garnierite'

References:

Milton, C., & Milton, D. J. (1958). Nickel-gold ore of the Mackinaw mine, Snohomish County, Washington. Economic Geology, 53(4), 426-447.

Valentine, Grant M., Huntting, Marshall T. (1960) Part II - Metallic Minerals, in Inventory of Washington Minerals. Vol II. Bulletin 37, Washington Geological Survey.

(2005) Mineral Resources Data System (MRDS), US Geological Survey.

ⓘ 'K Feldspar'

References:

John Lindell, pers. comm.Identified by Alfredo Petrov: Visual Identification

ⓘ 'K Feldspar var. Adularia'

Formula: KAlSi₃O₈

References:

John Lindell, pers. comm.Identified by Alfredo Petrov: Visual Identification

ⓘ Langite

Formula: Cu₄(SO₄)(OH)₆ · 2H₂O

References:

Robert O. Meyer collection

ⓘ Mackinawite (TL)

Formula: FeS

Type Locality:

References:

Cannon, Bart (1975) Minerals of Washington. Cordilleran. 184 pp.

ⓘ Magnetite

Formula: Fe²⁺Fe³⁺₂O₄

References:

Milton, C., & Milton, D. J. (1958). Nickel-gold ore of the Mackinaw mine, Snohomish County, Washington. Economic Geology, 53(4), 426-447.

ⓘ Malachite

Formula: Cu₂(CO₃)(OH)₂

References:

Milton, C., & Milton, D. J. (1958). Nickel-gold ore of the Mackinaw mine, Snohomish County, Washington. Economic Geology, 53(4), 426-447.

Valentine, Grant M., Huntting, Marshall T. (1960) Part II - Metallic Minerals, in Inventory of Washington Minerals. Vol II. Bulletin 37, Washington Geological Survey.

(2005) Mineral Resources Data System (MRDS), US Geological Survey.

ⓘ Maucherite

Formula: Ni₁₁As₈

References:

Milton, C., & Milton, D. J. (1958). Nickel-gold ore of the Mackinaw mine, Snohomish County, Washington. Economic Geology, 53(4), 426-447.

Cannon, Bart (1975) Minerals of Washington. Cordilleran. 184 pp.p.71

ⓘ Native Gold

Formula: Au

References:

Milton, C., & Milton, D. J. (1958). Nickel-gold ore of the Mackinaw mine, Snohomish County, Washington. Economic Geology, 53(4), 426-447.

ⓘ Nickeline

Formula: NiAs

References:

Milton, C., & Milton, D. J. (1958). Nickel-gold ore of the Mackinaw mine, Snohomish County, Washington. Economic Geology, 53(4), 426-447.

Cannon, Bart (1975) Minerals of Washington. Cordilleran. 184 pp.pages 45,62,71

ⓘ Nickelskutterudite

Formula: NiAs₃

References:

Valentine, Grant M., Huntting, Marshall T. (1960) Part II - Metallic Minerals, in Inventory of Washington Minerals. Vol II. Bulletin 37, Washington Geological Survey.

Cannon, Bart (1975) Minerals of Washington. Cordilleran. 184 pp.p.71

(2005) Mineral Resources Data System (MRDS), US Geological Survey.

ⓘ Parnauite

Formula: Cu₉(AsO₄)₂(SO₄)(OH)₁₀ · 7H₂O

References:

www.cannonmicroprobe.com/Mineral_Specimens.htm

ⓘ Pentlandite

Formula: (Ni_xFe_y)_Σ9S₈

References:

Milton, C., & Milton, D. J. (1958). Nickel-gold ore of the Mackinaw mine, Snohomish County, Washington. Economic Geology, 53(4), 426-447.

Valentine, Grant M., Huntting, Marshall T. (1960) Part II - Metallic Minerals, in Inventory of Washington Minerals. Vol II. Bulletin 37, Washington Geological Survey.

Cannon, Bart (1975) Minerals of Washington. Cordilleran. 184 pp.pages 45,62,72

(2005) Mineral Resources Data System (MRDS), US Geological Survey.

ⓘ Pyrite

Formula: FeS₂

References:

Valentine, Grant M., Huntting, Marshall T. (1960) Part II - Metallic Minerals, in Inventory of Washington Minerals. Vol II. Bulletin 37, Washington Geological Survey.

Cannon, Bart (1975) Minerals of Washington. Cordilleran. 184 pp.p.72

(2005) Mineral Resources Data System (MRDS), US Geological Survey.

ⓘ Pyrite var. Bravoite

Formula: (Fe,Ni)S₂

References:

Milton, C., & Milton, D. J. (1958). Nickel-gold ore of the Mackinaw mine, Snohomish County, Washington. Economic Geology, 53(4), 426-447.

Cannon, Bart (1975) Minerals of Washington. Cordilleran. 184 pp.p.62

ⓘ Pyrrhotite

Formula: Fe_1-xS

References:

Valentine, Grant M., Huntting, Marshall T. (1960) Part II - Metallic Minerals, in Inventory of Washington Minerals. Vol II. Bulletin 37, Washington Geological Survey.

(2005) Mineral Resources Data System (MRDS), US Geological Survey.

ⓘ Quartz

Formula: SiO₂

References:

Valentine, Grant M., Huntting, Marshall T. (1960) Part II - Metallic Minerals, in Inventory of Washington Minerals. Vol II. Bulletin 37, Washington Geological Survey.

(2005) Mineral Resources Data System (MRDS), US Geological Survey.

ⓘ 'Serpentine Subgroup'

Formula: D₃[Si₂O₅](OH)₄

References:

Milton, C., & Milton, D. J. (1958). Nickel-gold ore of the Mackinaw mine, Snohomish County, Washington. Economic Geology, 53(4), 426-447.

Valentine, Grant M., Huntting, Marshall T. (1960) Part II - Metallic Minerals, in Inventory of Washington Minerals. Vol II. Bulletin 37, Washington Geological Survey.

Cannon, Bart (1975) Minerals of Washington. Cordilleran. 184 pp.p.45

ⓘ Sphalerite

Formula: ZnS

References:

Milton, C., & Milton, D. J. (1958). Nickel-gold ore of the Mackinaw mine, Snohomish County, Washington. Economic Geology, 53(4), 426-447.

ⓘ Talc

Formula: Mg₃Si₄O₁₀(OH)₂

References:

Milton, C., & Milton, D. J. (1958). Nickel-gold ore of the Mackinaw mine, Snohomish County, Washington. Economic Geology, 53(4), 426-447.

ⓘ Titanite

Formula: CaTi(SiO₄)O

References:

John Lindell, pers. comm.Identified by Alfredo Petrov: Visual Identification

ⓘ Tremolite

Formula: ◻Ca₂Mg₅(Si₈O₂₂)(OH)₂

References:

Milton, C., & Milton, D. J. (1958). Nickel-gold ore of the Mackinaw mine, Snohomish County, Washington. Economic Geology, 53(4), 426-447.

ⓘ Valleriite

Formula: (Fe²⁺,Cu)₄(Mg,Al)₃S₄(OH,O)₆

References:

Milton, C., & Milton, D. J. (1958). Nickel-gold ore of the Mackinaw mine, Snohomish County, Washington. Economic Geology, 53(4), 426-447.

Cannon, Bart (1975) Minerals of Washington. Cordilleran. 184 pp.

ⓘ Violarite ?

Formula: Fe²⁺Ni³⁺₂S₄

References:

Milton, C., & Milton, D. J. (1958). Nickel-gold ore of the Mackinaw mine, Snohomish County, Washington. Economic Geology, 53(4), 426-447.

Gallery:

Ni₁₁As₈ⓘ Maucherite

Maucherite

Mackinaw Mine, Monte Cristo Mining District, Snohomish County, Washington, USA

Maucherite

Mackinaw Mine, Monte Cristo Mining District, Snohomish County, Washington, USA

Maucherite

Mackinaw Mine, Monte Cristo Mining District, Snohomish County, Washington, USA

Mg₃Si₄O₁₀(OH)₂ⓘ Talc

Talc

Mackinaw Mine, Monte Cristo Mining District, Snohomish County, Washington, USA

Talc

Mackinaw Mine, Monte Cristo Mining District, Snohomish County, Washington, USA

Talc

Mackinaw Mine, Monte Cristo Mining District, Snohomish County, Washington, USA

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
ⓘ	Native Gold	1.AA.05	Au
Group 2 - Sulphides and Sulfosalts
ⓘ	Maucherite	2.AB.15	Ni₁₁As₈
ⓘ	Chalcocite	2.BA.05	Cu₂S
ⓘ	Pentlandite	2.BB.15	(Ni_xFe_y)_Σ9S₈
ⓘ	Covellite	2.CA.05a	CuS
ⓘ	Sphalerite	2.CB.05a	ZnS
ⓘ	Chalcopyrite	2.CB.10a	CuFeS₂
ⓘ	Cubanite	2.CB.55a	CuFe₂S₃
ⓘ	Nickeline	2.CC.05	NiAs
ⓘ	Pyrrhotite	2.CC.10	Fe_1-xS
ⓘ	Mackinawite (TL)	2.CC.25	FeS
ⓘ	Violarite ?	2.DA.05	Fe²⁺Ni³⁺₂S₄
ⓘ	Pyrite var. Bravoite	2.EB.05a	(Fe,Ni)S₂
ⓘ		2.EB.05a	FeS₂
ⓘ	Arsenopyrite	2.EB.20	FeAsS
ⓘ	Nickelskutterudite	2.EC.05	NiAs₃
ⓘ	Valleriite	2.FD.30	(Fe²⁺,Cu)₄(Mg,Al)₃S₄(OH,O)₆
Group 4 - Oxides and Hydroxides
ⓘ	Magnetite	4.BB.05	Fe²⁺Fe³⁺₂O₄
ⓘ	Quartz	4.DA.05	SiO₂
Group 5 - Nitrates and Carbonates
ⓘ	Calcite	5.AB.05	CaCO₃
ⓘ	Malachite	5.BA.10	Cu₂(CO₃)(OH)₂
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
ⓘ	Langite	7.DD.10	Cu₄(SO₄)(OH)₆ · 2H₂O
Group 8 - Phosphates, Arsenates and Vanadates
ⓘ	Annabergite	8.CE.40	Ni₃(AsO₄)₂ · 8H₂O
ⓘ	Erythrite	8.CE.40	Co₃(AsO₄)₂ · 8H₂O
ⓘ	Parnauite	8.DF.35	Cu₉(AsO₄)₂(SO₄)(OH)₁₀ · 7H₂O
Group 9 - Silicates
ⓘ	Forsterite	9.AC.05	Mg₂(SiO₄)
ⓘ	Titanite	9.AG.15	CaTi(SiO₄)O
ⓘ	Actinolite	9.DE.10	◻Ca₂(Mg_4.5-2.5Fe_0.5-2.5)Si₈O₂₂(OH)₂
ⓘ	Tremolite	9.DE.10	◻Ca₂Mg₅(Si₈O₂₂)(OH)₂
ⓘ	Talc	9.EC.05	Mg₃Si₄O₁₀(OH)₂
ⓘ	Chrysocolla	9.ED.20	Cu_2-xAl_x(H_2-xSi₂O₅)(OH)₄ · nH₂O, x < 1
Unclassified
ⓘ	'K Feldspar var. Adularia'	-	KAlSi₃O₈
ⓘ	''	-
ⓘ	'Garnierite'	-
ⓘ	'Serpentine Subgroup'	-	D₃[Si₂O₅](OH)₄

List of minerals for each chemical element

H	Hydrogen
H	ⓘ Actinolite	◻Ca₂(Mg_4.5-2.5Fe_0.5-2.5)Si₈O₂₂(OH)₂
H	ⓘ Annabergite	Ni₃(AsO₄)₂ · 8H₂O
H	ⓘ Chrysocolla	Cu_2-xAl_x(H_2-xSi₂O₅)(OH)₄ · nH₂O, x < 1
H	ⓘ Erythrite	Co₃(AsO₄)₂ · 8H₂O
H	ⓘ Langite	Cu₄(SO₄)(OH)₆ · 2H₂O
H	ⓘ Malachite	Cu₂(CO₃)(OH)₂
H	ⓘ Parnauite	Cu₉(AsO₄)₂(SO₄)(OH)₁₀ · 7H₂O
H	ⓘ Talc	Mg₃Si₄O₁₀(OH)₂
H	ⓘ Tremolite	◻Ca₂Mg₅(Si₈O₂₂)(OH)₂
H	ⓘ Valleriite	(Fe²⁺,Cu)₄(Mg,Al)₃S₄(OH,O)₆
H	ⓘ Serpentine Subgroup	D₃[Si₂O₅](OH)₄
C	Carbon
C	ⓘ Calcite	CaCO₃
C	ⓘ Malachite	Cu₂(CO₃)(OH)₂
O	Oxygen
O	ⓘ Actinolite	◻Ca₂(Mg_4.5-2.5Fe_0.5-2.5)Si₈O₂₂(OH)₂
O	ⓘ K Feldspar var. Adularia	KAlSi₃O₈
O	ⓘ Annabergite	Ni₃(AsO₄)₂ · 8H₂O
O	ⓘ Calcite	CaCO₃
O	ⓘ Chrysocolla	Cu_2-xAl_x(H_2-xSi₂O₅)(OH)₄ · nH₂O, x < 1
O	ⓘ Erythrite	Co₃(AsO₄)₂ · 8H₂O
O	ⓘ Forsterite	Mg₂(SiO₄)
O	ⓘ Langite	Cu₄(SO₄)(OH)₆ · 2H₂O
O	ⓘ Magnetite	Fe²⁺Fe₂³⁺O₄
O	ⓘ Malachite	Cu₂(CO₃)(OH)₂
O	ⓘ Parnauite	Cu₉(AsO₄)₂(SO₄)(OH)₁₀ · 7H₂O
O	ⓘ Quartz	SiO₂
O	ⓘ Talc	Mg₃Si₄O₁₀(OH)₂
O	ⓘ Titanite	CaTi(SiO₄)O
O	ⓘ Tremolite	◻Ca₂Mg₅(Si₈O₂₂)(OH)₂
O	ⓘ Valleriite	(Fe²⁺,Cu)₄(Mg,Al)₃S₄(OH,O)₆
O	ⓘ Serpentine Subgroup	D₃[Si₂O₅](OH)₄
Mg	Magnesium
Mg	ⓘ Actinolite	◻Ca₂(Mg_4.5-2.5Fe_0.5-2.5)Si₈O₂₂(OH)₂
Mg	ⓘ Forsterite	Mg₂(SiO₄)
Mg	ⓘ Talc	Mg₃Si₄O₁₀(OH)₂
Mg	ⓘ Tremolite	◻Ca₂Mg₅(Si₈O₂₂)(OH)₂
Mg	ⓘ Valleriite	(Fe²⁺,Cu)₄(Mg,Al)₃S₄(OH,O)₆
Al	Aluminium
Al	ⓘ K Feldspar var. Adularia	KAlSi₃O₈
Al	ⓘ Chrysocolla	Cu_2-xAl_x(H_2-xSi₂O₅)(OH)₄ · nH₂O, x < 1
Al	ⓘ Valleriite	(Fe²⁺,Cu)₄(Mg,Al)₃S₄(OH,O)₆
Si	Silicon
Si	ⓘ Actinolite	◻Ca₂(Mg_4.5-2.5Fe_0.5-2.5)Si₈O₂₂(OH)₂
Si	ⓘ K Feldspar var. Adularia	KAlSi₃O₈
Si	ⓘ Chrysocolla	Cu_2-xAl_x(H_2-xSi₂O₅)(OH)₄ · nH₂O, x < 1
Si	ⓘ Forsterite	Mg₂(SiO₄)
Si	ⓘ Quartz	SiO₂
Si	ⓘ Talc	Mg₃Si₄O₁₀(OH)₂
Si	ⓘ Titanite	CaTi(SiO₄)O
Si	ⓘ Tremolite	◻Ca₂Mg₅(Si₈O₂₂)(OH)₂
Si	ⓘ Serpentine Subgroup	D₃[Si₂O₅](OH)₄
S	Sulfur
S	ⓘ Arsenopyrite	FeAsS
S	ⓘ Pyrite var. Bravoite	(Fe,Ni)S₂
S	ⓘ Chalcopyrite	CuFeS₂
S	ⓘ Chalcocite	Cu₂S
S	ⓘ Covellite	CuS
S	ⓘ Cubanite	CuFe₂S₃
S	ⓘ Langite	Cu₄(SO₄)(OH)₆ · 2H₂O
S	ⓘ Mackinawite	FeS
S	ⓘ Parnauite	Cu₉(AsO₄)₂(SO₄)(OH)₁₀ · 7H₂O
S	ⓘ Pentlandite	(Ni_xFe_y)_Σ9S₈
S	ⓘ Pyrite	FeS₂
S	ⓘ Pyrrhotite	Fe_1-xS
S	ⓘ Sphalerite	ZnS
S	ⓘ Valleriite	(Fe²⁺,Cu)₄(Mg,Al)₃S₄(OH,O)₆
S	ⓘ Violarite	Fe²⁺Ni₂³⁺S₄
K	Potassium
K	ⓘ K Feldspar var. Adularia	KAlSi₃O₈
Ca	Calcium
Ca	ⓘ Actinolite	◻Ca₂(Mg_4.5-2.5Fe_0.5-2.5)Si₈O₂₂(OH)₂
Ca	ⓘ Calcite	CaCO₃
Ca	ⓘ Titanite	CaTi(SiO₄)O
Ca	ⓘ Tremolite	◻Ca₂Mg₅(Si₈O₂₂)(OH)₂
Ti	Titanium
Ti	ⓘ Titanite	CaTi(SiO₄)O
Fe	Iron
Fe	ⓘ Actinolite	◻Ca₂(Mg_4.5-2.5Fe_0.5-2.5)Si₈O₂₂(OH)₂
Fe	ⓘ Arsenopyrite	FeAsS
Fe	ⓘ Pyrite var. Bravoite	(Fe,Ni)S₂
Fe	ⓘ Chalcopyrite	CuFeS₂
Fe	ⓘ Cubanite	CuFe₂S₃
Fe	ⓘ Mackinawite	FeS
Fe	ⓘ Magnetite	Fe²⁺Fe₂³⁺O₄
Fe	ⓘ Pentlandite	(Ni_xFe_y)_Σ9S₈
Fe	ⓘ Pyrite	FeS₂
Fe	ⓘ Pyrrhotite	Fe_1-xS
Fe	ⓘ Valleriite	(Fe²⁺,Cu)₄(Mg,Al)₃S₄(OH,O)₆
Fe	ⓘ Violarite	Fe²⁺Ni₂³⁺S₄
Co	Cobalt
Co	ⓘ Erythrite	Co₃(AsO₄)₂ · 8H₂O
Ni	Nickel
Ni	ⓘ Annabergite	Ni₃(AsO₄)₂ · 8H₂O
Ni	ⓘ Pyrite var. Bravoite	(Fe,Ni)S₂
Ni	ⓘ Maucherite	Ni₁₁As₈
Ni	ⓘ Nickelskutterudite	NiAs₃
Ni	ⓘ Nickeline	NiAs
Ni	ⓘ Pentlandite	(Ni_xFe_y)_Σ9S₈
Ni	ⓘ Violarite	Fe²⁺Ni₂³⁺S₄
Cu	Copper
Cu	ⓘ Chalcopyrite	CuFeS₂
Cu	ⓘ Chalcocite	Cu₂S
Cu	ⓘ Chrysocolla	Cu_2-xAl_x(H_2-xSi₂O₅)(OH)₄ · nH₂O, x < 1
Cu	ⓘ Covellite	CuS
Cu	ⓘ Cubanite	CuFe₂S₃
Cu	ⓘ Langite	Cu₄(SO₄)(OH)₆ · 2H₂O
Cu	ⓘ Malachite	Cu₂(CO₃)(OH)₂
Cu	ⓘ Parnauite	Cu₉(AsO₄)₂(SO₄)(OH)₁₀ · 7H₂O
Cu	ⓘ Valleriite	(Fe²⁺,Cu)₄(Mg,Al)₃S₄(OH,O)₆
Zn	Zinc
Zn	ⓘ Sphalerite	ZnS
As	Arsenic
As	ⓘ Annabergite	Ni₃(AsO₄)₂ · 8H₂O
As	ⓘ Arsenopyrite	FeAsS
As	ⓘ Erythrite	Co₃(AsO₄)₂ · 8H₂O
As	ⓘ Maucherite	Ni₁₁As₈
As	ⓘ Nickelskutterudite	NiAs₃
As	ⓘ Nickeline	NiAs
As	ⓘ Parnauite	Cu₉(AsO₄)₂(SO₄)(OH)₁₀ · 7H₂O
Au	Gold
Au	ⓘ Native Gold	Au

Other Databases

Link to USGS MRDS:	10155721
Link to USGS MRDS:	10068218

Other Regions, Features and Areas containing this locality

North AmericaContinent

Cascade RangeMountain Range

North America PlateTectonic Plate

Cascade ArcVolcanic Arc
Franciscan DomainDomain

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

(1944) Mackinaw Metals Mine Snohomish County, Wash. US Bureau of Mines War Minerals Report 156

Broughton, W. (1942) Inventory of Mineral Properties in Snohomish County, Washington. State of Washington Department of Conservation and Development Report of Investigations number 6, 73 pages.

Milton, C., & Milton, D. J. (1958). Nickel-gold ore of the Mackinaw mine, Snohomish County, Washington. Economic Geology, 53(4), 426-447.

Valentine, Grant M., Huntting, Marshall T. (1960) Part II - Metallic Minerals, in Inventory of Washington Minerals. Vol II. Bulletin 37, Washington Geological Survey.

(1966) Nickel deposits of North America. Bulletin 1223. US Geological Survey doi:10.3133/b1223

Cannon, Bart (1975) Minerals of Washington. Cordilleran. 184 pp.

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