Hausel, W.D. (2007) Diamonds & Mantle Source Rocks in the Wyoming Craton (with discussions on the North American Craton & unconventional source terrains). Wyoming State Geological Survey, 93 pages.

ⓘ Graphite

Formula: C

Locality: Sloan 2, Sloan diatremes, State Line Kimberlite Mining District, Larimer County, Colorado, USA

References:

Econ Geol (1992) 87:2175-2179

ⓘ Ilmenite

Formula: Fe²⁺TiO₃

Localities:

Sloan diatremes, State Line Kimberlite Mining District, Larimer County, Colorado, USA
Sloan No. 2 diatreme (Kopylovite Type Locality), Sloan diatremes, State Line Kimberlite Mining District, Larimer County, Colorado, USA

ⓘ Ilmenite var. Picroilmenite

Formula: (Fe²⁺,Mg)TiO₃

Locality: Sloan No. 2 diatreme (Kopylovite Type Locality), Sloan diatremes, State Line Kimberlite Mining District, Larimer County, Colorado, USA

References:

ⓘ Kopylovite (TL)

Formula: K₂Ti(Si₃O₉)

Type Locality:

References:

Korolev, N., Kiseeva, E.S., Glazyrin, K., Ma, C. and Howarth, G.H. (2026) Kopylovite, IMA 2025-084. CNMNC Newsletter 89, Mineralogical Magazine, 90, https://doi.org/10.1180/mgm.2026.10199.

ⓘ 'Leucoxene'

References:

Eckel, Edwin Butt; Cobban, Robert R.; Mosburg, Shirley K.; Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.

ⓘ Lizardite

Formula: Mg₃(Si₂O₅)(OH)₄

References:

Eckel, Edwin Butt; Cobban, Robert R.; Mosburg, Shirley K.; Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.

ⓘ Perovskite

Formula: CaTiO₃

References:

Eckel, Edwin Butt; Cobban, Robert R.; Mosburg, Shirley K.; Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.

ⓘ Phlogopite

Formula: KMg₃(AlSi₃O₁₀)(OH)₂

References:

Eckel, Edwin Butt; Cobban, Robert R.; Mosburg, Shirley K.; Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.

ⓘ Pyrope

Formula: Mg₃Al₂(SiO₄)₃

Localities:

Sloan No. 2 diatreme (Kopylovite Type Locality), Sloan diatremes, State Line Kimberlite Mining District, Larimer County, Colorado, USA
Sloan diatremes, State Line Kimberlite Mining District, Larimer County, Colorado, USA

ⓘ Spinel

Formula: MgAl₂O₄

References:

Eckel, Edwin Butt; Cobban, Robert R.; Mosburg, Shirley K.; Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.

ⓘ Vesuvianite

Formula: Ca₁₉Fe³⁺Al₄(Al₆Mg₂)(◻₄)◻[Si₂O₇]₄[(SiO₄)₁₀]O(OH)₉

References:

Eckel, Edwin Butt; Cobban, Robert R.; Mosburg, Shirley K.; Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing.

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
ⓘ	Graphite	1.CB.05a	C
ⓘ	Diamond	1.CB.10a	C
Group 4 - Oxides and Hydroxides
ⓘ	Chromite	4.BB.05	Fe²⁺Cr³⁺₂O₄
ⓘ	Spinel	4.BB.05	MgAl₂O₄
ⓘ	Ilmenite	4.CB.05	Fe²⁺TiO₃
ⓘ	var. Picroilmenite	4.CB.05	(Fe²⁺,Mg)TiO₃
ⓘ	Perovskite	4.CC.30	CaTiO₃
Group 5 - Nitrates and Carbonates
ⓘ	Calcite	5.AB.05	CaCO₃
ⓘ	Aragonite	5.AB.15	CaCO₃
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
ⓘ	Baryte	7.AD.35	BaSO₄
Group 9 - Silicates
ⓘ	Chrysotile	9.00.	Mg₃(Si₂O₅)(OH)₄
ⓘ	Pyrope	9.AD.25	Mg₃Al₂(SiO₄)₃
ⓘ	Vesuvianite	9.BG.35	Ca₁₉Fe³⁺Al₄(Al₆Mg₂)(◻₄)◻[Si₂O₇]₄[(SiO₄)₁₀]O(OH)₉
ⓘ	Kopylovite (TL)	9.CA.	K₂Ti(Si₃O₉)
ⓘ	Enstatite	9.DA.05	Mg₂Si₂O₆
ⓘ	Diopside var. Chromium-bearing Diopside	9.DA.15	Ca(Mg,Cr)Si₂O₆
ⓘ		9.DA.15	CaMgSi₂O₆
ⓘ	Phlogopite	9.EC.20	KMg₃(AlSi₃O₁₀)(OH)₂
ⓘ	Antigorite	9.ED.15	Mg₃(Si₂O₅)(OH)₄
ⓘ	Lizardite	9.ED.15	Mg₃(Si₂O₅)(OH)₄
Unclassified
ⓘ	'Leucoxene'	-
ⓘ	'Fayalite-Forsterite Series'	-
ⓘ	'Garnet Group'	-	X₃Z₂(SiO₄)₃

List of minerals for each chemical element

H	Hydrogen
H	ⓘ Antigorite	Mg₃(Si₂O₅)(OH)₄
H	ⓘ Chrysotile	Mg₃(Si₂O₅)(OH)₄
H	ⓘ Lizardite	Mg₃(Si₂O₅)(OH)₄
H	ⓘ Phlogopite	KMg₃(AlSi₃O₁₀)(OH)₂
H	ⓘ Vesuvianite	Ca₁₉Fe³⁺Al₄(Al₆Mg₂)(◻₄)◻[Si₂O₇]₄[(SiO₄)₁₀]O(OH)₉
C	Carbon
C	ⓘ Aragonite	CaCO₃
C	ⓘ Calcite	CaCO₃
C	ⓘ Diamond	C
C	ⓘ Graphite	C
O	Oxygen
O	ⓘ Antigorite	Mg₃(Si₂O₅)(OH)₄
O	ⓘ Aragonite	CaCO₃
O	ⓘ Baryte	BaSO₄
O	ⓘ Calcite	CaCO₃
O	ⓘ Chrysotile	Mg₃(Si₂O₅)(OH)₄
O	ⓘ Diopside var. Chromium-bearing Diopside	Ca(Mg,Cr)Si₂O₆
O	ⓘ Chromite	Fe²⁺Cr₂³⁺O₄
O	ⓘ Diopside	CaMgSi₂O₆
O	ⓘ Enstatite	Mg₂Si₂O₆
O	ⓘ Ilmenite	Fe²⁺TiO₃
O	ⓘ Lizardite	Mg₃(Si₂O₅)(OH)₄
O	ⓘ Perovskite	CaTiO₃
O	ⓘ Phlogopite	KMg₃(AlSi₃O₁₀)(OH)₂
O	ⓘ Pyrope	Mg₃Al₂(SiO₄)₃
O	ⓘ Spinel	MgAl₂O₄
O	ⓘ Vesuvianite	Ca₁₉Fe³⁺Al₄(Al₆Mg₂)(◻₄)◻[Si₂O₇]₄[(SiO₄)₁₀]O(OH)₉
O	ⓘ Fayalite-Forsterite Series
O	ⓘ Garnet Group	X₃Z₂(SiO₄)₃
O	ⓘ Ilmenite var. Picroilmenite	(Fe²⁺,Mg)TiO₃
O	ⓘ Kopylovite	K₂Ti(Si₃O₉)
Mg	Magnesium
Mg	ⓘ Antigorite	Mg₃(Si₂O₅)(OH)₄
Mg	ⓘ Chrysotile	Mg₃(Si₂O₅)(OH)₄
Mg	ⓘ Diopside var. Chromium-bearing Diopside	Ca(Mg,Cr)Si₂O₆
Mg	ⓘ Diopside	CaMgSi₂O₆
Mg	ⓘ Enstatite	Mg₂Si₂O₆
Mg	ⓘ Lizardite	Mg₃(Si₂O₅)(OH)₄
Mg	ⓘ Phlogopite	KMg₃(AlSi₃O₁₀)(OH)₂
Mg	ⓘ Pyrope	Mg₃Al₂(SiO₄)₃
Mg	ⓘ Spinel	MgAl₂O₄
Mg	ⓘ Vesuvianite	Ca₁₉Fe³⁺Al₄(Al₆Mg₂)(◻₄)◻[Si₂O₇]₄[(SiO₄)₁₀]O(OH)₉
Mg	ⓘ Fayalite-Forsterite Series
Mg	ⓘ Ilmenite var. Picroilmenite	(Fe²⁺,Mg)TiO₃
Al	Aluminium
Al	ⓘ Phlogopite	KMg₃(AlSi₃O₁₀)(OH)₂
Al	ⓘ Pyrope	Mg₃Al₂(SiO₄)₃
Al	ⓘ Spinel	MgAl₂O₄
Al	ⓘ Vesuvianite	Ca₁₉Fe³⁺Al₄(Al₆Mg₂)(◻₄)◻[Si₂O₇]₄[(SiO₄)₁₀]O(OH)₉
Si	Silicon
Si	ⓘ Antigorite	Mg₃(Si₂O₅)(OH)₄
Si	ⓘ Chrysotile	Mg₃(Si₂O₅)(OH)₄
Si	ⓘ Diopside var. Chromium-bearing Diopside	Ca(Mg,Cr)Si₂O₆
Si	ⓘ Diopside	CaMgSi₂O₆
Si	ⓘ Enstatite	Mg₂Si₂O₆
Si	ⓘ Lizardite	Mg₃(Si₂O₅)(OH)₄
Si	ⓘ Phlogopite	KMg₃(AlSi₃O₁₀)(OH)₂
Si	ⓘ Pyrope	Mg₃Al₂(SiO₄)₃
Si	ⓘ Vesuvianite	Ca₁₉Fe³⁺Al₄(Al₆Mg₂)(◻₄)◻[Si₂O₇]₄[(SiO₄)₁₀]O(OH)₉
Si	ⓘ Fayalite-Forsterite Series
Si	ⓘ Garnet Group	X₃Z₂(SiO₄)₃
Si	ⓘ Kopylovite	K₂Ti(Si₃O₉)
S	Sulfur
S	ⓘ Baryte	BaSO₄
K	Potassium
K	ⓘ Phlogopite	KMg₃(AlSi₃O₁₀)(OH)₂
K	ⓘ Kopylovite	K₂Ti(Si₃O₉)
Ca	Calcium
Ca	ⓘ Aragonite	CaCO₃
Ca	ⓘ Calcite	CaCO₃
Ca	ⓘ Diopside var. Chromium-bearing Diopside	Ca(Mg,Cr)Si₂O₆
Ca	ⓘ Diopside	CaMgSi₂O₆
Ca	ⓘ Perovskite	CaTiO₃
Ca	ⓘ Vesuvianite	Ca₁₉Fe³⁺Al₄(Al₆Mg₂)(◻₄)◻[Si₂O₇]₄[(SiO₄)₁₀]O(OH)₉
Ti	Titanium
Ti	ⓘ Ilmenite	Fe²⁺TiO₃
Ti	ⓘ Perovskite	CaTiO₃
Ti	ⓘ Ilmenite var. Picroilmenite	(Fe²⁺,Mg)TiO₃
Ti	ⓘ Kopylovite	K₂Ti(Si₃O₉)
Cr	Chromium
Cr	ⓘ Diopside var. Chromium-bearing Diopside	Ca(Mg,Cr)Si₂O₆
Cr	ⓘ Chromite	Fe²⁺Cr₂³⁺O₄
Fe	Iron
Fe	ⓘ Chromite	Fe²⁺Cr₂³⁺O₄
Fe	ⓘ Ilmenite	Fe²⁺TiO₃
Fe	ⓘ Vesuvianite	Ca₁₉Fe³⁺Al₄(Al₆Mg₂)(◻₄)◻[Si₂O₇]₄[(SiO₄)₁₀]O(OH)₉
Fe	ⓘ Fayalite-Forsterite Series
Fe	ⓘ Ilmenite var. Picroilmenite	(Fe²⁺,Mg)TiO₃
Ba	Barium
Ba	ⓘ Baryte	BaSO₄

Localities in this Region

USA

Colorado
- Larimer County
  - State Line Kimberlite Mining District
    - Sloan diatremes
      - Sloan 2
      - Sloan No. 2 diatreme (Kopylovite Type Locality)

Other Regions, Features and Areas containing this locality

North AmericaContinent

Rocky MountainsMountain Range

North America PlateTectonic Plate

Great Plains DomainDomain
Southern Rocky MountainsOrogenic Belt

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

Collins, Donley S. (1982) Diamond Collecting in Northern Colorado. The Mineralogical Record, 13 (4) 205-208

Meyer, H.O.A. and McCallum, M.E. (1986) Mineral inclusions in diamonds from the Sloan kimberlites, Colorado. Journal of Geology: 94: 600-612.

Otter, M.L. and Gurney, J.J. (1989) Mineral inclusions in diamonds from the Sloan diatreme, Colorado-Wyoming State Line kimberlite district, North America. In Kimberlite and Related Rocks, Volume 2: Their Mantle/Crust Setting, Diamonds and Diamond Exploration; Geological Society of Australia, Special Publication, 14, 1042–1053. Blackwell Scientific, Cambridge, England.

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