A prominent Y-shaped body within the Animikie Basin, intruding sulphur-bearing greywacke and mudstone of the Paleoproterozoic Rove Formation. The intrusion, which comprises a northern and southern limb, is eastward plunging and lopolithic to dyke-like in shape. Overall, the intrusion is comprised of a basal, sulphide-bearing taxitic gabbro unit, progressing upwards into a sequence of mineralised gabbro and chrome-spinel horizons overlain by a thick (>300 m) succession of homogeneous, unmineralised troctolite or magnetite-bearing olivine gabbro in the northern and southern limbs, respectively.

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Standard Detailed Gallery Strunz Chemical Elements

Commodity List

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

ⓘ Copper

ⓘ Nickel

ⓘ Platinum-Group Metals

Mineral List

14 valid minerals.

Rock Types Recorded

Note: data is currently VERY limited. Please bear with us while we work towards adding this information!

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Alphabetical List Tree Diagram

Detailed Mineral List:

ⓘ 'Amphibole Supergroup'

Formula: AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂

References:

Smith, J., Bleeker, W., & Petts, D. C. (2022). Distribution of siderophile elements during sulphide fractionation within magmatic Ni-Cu-PGE systems: A LA-ICP-MS investigation of the Crystal Lake Intrusion, 1.1 Ga Midcontinent rift. Ore Geology Reviews, 148, 105002.

ⓘ Augite

Formula: (Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆

References:

ⓘ 'Biotite'

Formula: K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂

References:

ⓘ Calcite

Formula: CaCO₃

References:

ⓘ Chalcopyrite

Formula: CuFeS₂

References:

ⓘ 'Chlorite Group'

References:

ⓘ 'Chrome-Spinel (of Dana)'

References:

ⓘ Cubanite

Formula: CuFe₂S₃

References:

ⓘ Mackinawite

Formula: FeS

References:

ⓘ Magnetite

Formula: Fe²⁺Fe³⁺₂O₄

References:

ⓘ Marcasite

Formula: FeS₂

References:

ⓘ 'Olivine Group'

Formula: M₂SiO₄

References:

ⓘ Pentlandite

Formula: (Ni_xFe_y)_Σ9S₈

References:

ⓘ Prehnite

Formula: Ca₂Al₂Si₃O₁₀(OH)₂

References:

ⓘ Pyrite

Formula: FeS₂

References:

ⓘ Pyrite var. Bravoite

Formula: (Fe,Ni)S₂

References:

ⓘ Pyrrhotite

Formula: Fe_1-xS

References:

ⓘ Spinel

Formula: MgAl₂O₄

References:

ⓘ Troilite

Formula: FeS

References:

ⓘ Violarite

Formula: Fe²⁺Ni³⁺₂S₄

References:

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
ⓘ	Pentlandite	2.BB.15	(Ni_xFe_y)_Σ9S₈
ⓘ	Chalcopyrite	2.CB.10a	CuFeS₂
ⓘ	Cubanite	2.CB.55a	CuFe₂S₃
ⓘ	Pyrrhotite	2.CC.10	Fe_1-xS
ⓘ	Troilite	2.CC.10	FeS
ⓘ	Mackinawite	2.CC.25	FeS
ⓘ	Violarite	2.DA.05	Fe²⁺Ni³⁺₂S₄
ⓘ	Pyrite var. Bravoite	2.EB.05a	(Fe,Ni)S₂
ⓘ		2.EB.05a	FeS₂
ⓘ	Marcasite	2.EB.10a	FeS₂
Group 4 - Oxides and Hydroxides
ⓘ	Magnetite	4.BB.05	Fe²⁺Fe³⁺₂O₄
ⓘ	Spinel	4.BB.05	MgAl₂O₄
Group 5 - Nitrates and Carbonates
ⓘ	Calcite	5.AB.05	CaCO₃
Group 9 - Silicates
ⓘ	Augite	9.DA.15	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
ⓘ	Prehnite	9.DP.20	Ca₂Al₂Si₃O₁₀(OH)₂
Unclassified
ⓘ	'Amphibole Supergroup'	-	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
ⓘ	'Biotite'	-	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
ⓘ	'Chlorite Group'	-
ⓘ	'Chrome-Spinel (of Dana)'	-
ⓘ	'Olivine Group'	-	M₂SiO₄

List of minerals for each chemical element

H	Hydrogen
H	ⓘ Amphibole Supergroup	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
H	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
H	ⓘ Prehnite	Ca₂Al₂Si₃O₁₀(OH)₂
C	Carbon
C	ⓘ Calcite	CaCO₃
O	Oxygen
O	ⓘ Amphibole Supergroup	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
O	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
O	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
O	ⓘ Calcite	CaCO₃
O	ⓘ Magnetite	Fe²⁺Fe₂³⁺O₄
O	ⓘ Prehnite	Ca₂Al₂Si₃O₁₀(OH)₂
O	ⓘ Spinel	MgAl₂O₄
O	ⓘ Olivine Group	M₂SiO₄
F	Fluorine
F	ⓘ Amphibole Supergroup	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
F	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Mg	Magnesium
Mg	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Mg	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Mg	ⓘ Spinel	MgAl₂O₄
Al	Aluminium
Al	ⓘ Amphibole Supergroup	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
Al	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Al	ⓘ Prehnite	Ca₂Al₂Si₃O₁₀(OH)₂
Al	ⓘ Spinel	MgAl₂O₄
Si	Silicon
Si	ⓘ Amphibole Supergroup	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
Si	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Si	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Si	ⓘ Prehnite	Ca₂Al₂Si₃O₁₀(OH)₂
Si	ⓘ Olivine Group	M₂SiO₄
S	Sulfur
S	ⓘ Pyrite var. Bravoite	(Fe,Ni)S₂
S	ⓘ Chalcopyrite	CuFeS₂
S	ⓘ Cubanite	CuFe₂S₃
S	ⓘ Mackinawite	FeS
S	ⓘ Marcasite	FeS₂
S	ⓘ Pentlandite	(Ni_xFe_y)_Σ9S₈
S	ⓘ Pyrite	FeS₂
S	ⓘ Pyrrhotite	Fe_1-xS
S	ⓘ Troilite	FeS
S	ⓘ Violarite	Fe²⁺Ni₂³⁺S₄
Cl	Chlorine
Cl	ⓘ Amphibole Supergroup	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
K	Potassium
K	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Ca	Calcium
Ca	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Ca	ⓘ Calcite	CaCO₃
Ca	ⓘ Prehnite	Ca₂Al₂Si₃O₁₀(OH)₂
Ti	Titanium
Ti	ⓘ Amphibole Supergroup	AB₂C₅((Si,Al,Ti)₈O₂₂)(OH,F,Cl,O)₂
Ti	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Fe	Iron
Fe	ⓘ Augite	(Ca_xMg_yFe_z)(Mg_y1Fe_z1)Si₂O₆
Fe	ⓘ Biotite	K(Fe²⁺/Mg)₂(Al/Fe³⁺/Mg/Ti)([Si/Al/Fe]₂Si₂O₁₀)(OH/F)₂
Fe	ⓘ Pyrite var. Bravoite	(Fe,Ni)S₂
Fe	ⓘ Chalcopyrite	CuFeS₂
Fe	ⓘ Cubanite	CuFe₂S₃
Fe	ⓘ Mackinawite	FeS
Fe	ⓘ Magnetite	Fe²⁺Fe₂³⁺O₄
Fe	ⓘ Marcasite	FeS₂
Fe	ⓘ Pentlandite	(Ni_xFe_y)_Σ9S₈
Fe	ⓘ Pyrite	FeS₂
Fe	ⓘ Pyrrhotite	Fe_1-xS
Fe	ⓘ Troilite	FeS
Fe	ⓘ Violarite	Fe²⁺Ni₂³⁺S₄
Ni	Nickel
Ni	ⓘ Pyrite var. Bravoite	(Fe,Ni)S₂
Ni	ⓘ Pentlandite	(Ni_xFe_y)_Σ9S₈
Ni	ⓘ Violarite	Fe²⁺Ni₂³⁺S₄
Cu	Copper
Cu	ⓘ Chalcopyrite	CuFeS₂
Cu	ⓘ Cubanite	CuFe₂S₃

Other Regions, Features and Areas containing this locality

North AmericaContinent

North America Plate

Mid-continent RiftNarrow Rift

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References

[1]Smith, J., Bleeker, W., & Petts, D. C. (2022). Distribution of siderophile elements during sulphide fractionation within magmatic Ni-Cu-PGE systems: A LA-ICP-MS investigation of the Crystal Lake Intrusion, 1.1 Ga Midcontinent rift. Ore Geology Reviews, 148, 105002.

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