Vote for your favorite mineral in #MinCup26! - Sphalerite vs. Anorthite
Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
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Index Mining District, Snohomish County, Washington, USAi
Regional Level Types
Index Mining DistrictMining District
Snohomish CountyCounty
WashingtonState
USACountry

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PhotosMapsSearchMineralogy
04159970017272045221675.jpg
American Arsenic Mill

American Arsenic Mine, Reiter, Index Mining District, Snohomish County, Washington, USA
05861280017272040519421.jpg
Sunset Main Portal

Sunset Mine, Trout Creek, Index Mining District, Snohomish County, Washington, USA
01915900017272040575649.jpg
Uncle Sam Mine

Uncle Sam Mine, Index Mining District, Snohomish County, Washington, USA
03834270017272040594577.jpg
Uncle Sam Mine Flooded Adit

Uncle Sam Mine, Index Mining District, Snohomish County, Washington, USA
04159970017272045221675.jpg
American Arsenic Mill

American Arsenic Mine, Reiter, Index Mining District, Snohomish County, Washington, USA
05861280017272040519421.jpg
Sunset Main Portal

Sunset Mine, Trout Creek, Index Mining District, Snohomish County, Washington, USA
01915900017272040575649.jpg
Uncle Sam Mine

Uncle Sam Mine, Index Mining District, Snohomish County, Washington, USA
03834270017272040594577.jpg
Uncle Sam Mine Flooded Adit

Uncle Sam Mine, Index Mining District, Snohomish County, Washington, USA
06791930017272045244978.jpg
American Arsenic Mill

American Arsenic Mine, Reiter, Index Mining District, Snohomish County, Washington, USA
05861280017272040519421.jpg
Sunset Main Portal

Sunset Mine, Trout Creek, Index Mining District, Snohomish County, Washington, USA


References:
*Cannon, B. (1975): Minerals of Washington, p.60

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded from this region.


Mineral List

Mineral list contains entries from the region specified including sub-localities

44 valid minerals.

Rock Types Recorded


Rock list contains entries from the region specified including sub-localities

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

ⓘ Actinolite
Formula: ◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
ⓘ Albite
Formula: Na(AlSi3O8)
Habit: sharp crystals under 1/2"
Colour: white
ⓘ Almandine
Formula: Fe2+3Al2(SiO4)3
ⓘ Andalusite
Formula: Al2(SiO4)O
Habit: crystals to 1cm long
ⓘ Anorthite
Formula: Ca(Al2Si2O8)
Habit: lath like crystals
ⓘ Anorthite var. Bytownite
Formula: (Ca,Na)[Al(Al,Si)Si2O8]
Habit: lath like crystals
ⓘ 'Apatite'
Formula: Ca5(PO4)3A
Habit: well formed elongated prisms to 2 1/4" long
Colour: greyish
ⓘ Arsenolite
Formula: As2O3
ⓘ Azurite
Formula: Cu3(CO3)2(OH)2
ⓘ 'Biotite'
Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Habit: sheets to 8" in diameter
ⓘ Bornite
Formula: Cu5FeS4
Localities: Reported from at least 22 localities in this region.
ⓘ Calcite
Formula: CaCO3
Localities: Reported from at least 9 localities in this region.
ⓘ 'Calcium Amphibole Subgroup'
Formula: AnCa2(C2+5-mC3+m)(Si8-(n+m)Al(n+m))W2
ⓘ 'Calcium Amphibole Subgroup var. Hornblende'
Formula: AnCa2(Z2+5-mZ3+m)(Si8-(n+m)Al(n+m))(OH,F,Cl)2
ⓘ Celestine
Formula: SrSO4
ⓘ Chalcocite
Formula: Cu2S
Localities: Reported from at least 9 localities in this region.
ⓘ Chalcopyrite
Formula: CuFeS2
Localities: Reported from at least 28 localities in this region.
ⓘ 'Chlorite Group'
ⓘ Covellite
Formula: CuS
ⓘ Cummingtonite
Formula: ◻Mg2Mg5(Si8O22)(OH)2
ⓘ Cuprite
Formula: Cu2O
ⓘ Diopside
Formula: CaMgSi2O6
ⓘ Epidote
Formula: (CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Habit: fibrous sprays to 2.5" in diameter
Colour: pistachio green
ⓘ Fluorite
Formula: CaF2
ⓘ 'Garnet Group'
Formula: X3Z2(SiO4)3
ⓘ Grossular
Formula: Ca3Al2(SiO4)3
ⓘ Hematite
Formula: Fe2O3
ⓘ 'Hornblende Root Name Group'
Formula: ◻Ca2(C2+4C3+)(AlSi7O22)W2
ⓘ Kaolinite
Formula: Al2(Si2O5)(OH)4
ⓘ Magnetite
Formula: Fe2+Fe3+2O4
ⓘ Malachite
Formula: Cu2(CO3)(OH)2
ⓘ Marcasite
Formula: FeS2
ⓘ Microcline
Formula: K(AlSi3O8)
ⓘ Molybdenite
Formula: MoS2
ⓘ Molybdite
Formula: MoO3
ⓘ Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Habit: sheets to 8" in diameter
ⓘ Native Copper
Formula: Cu
ⓘ Native Gold
Formula: Au
ⓘ Native Silver
Formula: Ag
ⓘ Orpiment
Formula: As2S3
ⓘ Pennantite
Formula: Mn2+5Al(AlSi3O10)(OH)8
ⓘ Prehnite
Formula: Ca2Al2Si3O10(OH)2
Habit: crystals
ⓘ 'Pumpellyite Subgroup'
Formula: Ca2XAl2[Si2O6(OH)][SiO4](OH)2A
ⓘ Pyrite
Formula: FeS2
Localities: Reported from at least 21 localities in this region.
ⓘ Quartz
Formula: SiO2
Localities: Reported from at least 22 localities in this region.
ⓘ Quartz var. Amethyst
Formula: SiO2
ⓘ Quartz var. Rock Crystal
Formula: SiO2
ⓘ Realgar
Formula: As4S4
ⓘ Scheelite
Formula: Ca(WO4)
ⓘ 'Serpentine Subgroup'
Formula: D3[Si2O5](OH)4
ⓘ Sphalerite
Formula: ZnS
ⓘ Staurolite
Formula: Fe2+2Al9Si4O23(OH)
ⓘ 'Stilbite Subgroup'
Formula: M6-7[Al8-9Si27-28O72] · nH2O
ⓘ Stilpnomelane
Formula: K4Fe2+48[Si64Al8]O164(OH)52 · nH2O
ⓘ Talc
Formula: Mg3Si4O10(OH)2
ⓘ Titanite
Formula: CaTiO(SiO4)
ⓘ 'Tourmaline'
Formula: AD3G6(T6O18)(BO3)3X3Z
ⓘ Uraninite
Formula: UO2

Gallery:

Cu5FeS4ⓘ Bornite
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Bornite

Sunset Mine, Trout Creek, Index Mining District, Snohomish County, Washington, USA
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Bornite

Sunset Mine, Trout Creek, Index Mining District, Snohomish County, Washington, USA
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Bornite, etc.

Copper Belle Mine, Reiter, Index Mining District, Snohomish County, Washington, USA
trans.png
Bornite

Sunset Mine, Trout Creek, Index Mining District, Snohomish County, Washington, USA
trans.png
Bornite

Sunset Mine, Trout Creek, Index Mining District, Snohomish County, Washington, USA
trans.png
Bornite

Sunset Mine, Trout Creek, Index Mining District, Snohomish County, Washington, USA
trans.png
Bornite, etc.

Copper Belle Mine, Reiter, Index Mining District, Snohomish County, Washington, USA
trans.png
Bornite

Sunset Mine, Trout Creek, Index Mining District, Snohomish County, Washington, USA
trans.png
Bornite

Sunset Mine, Trout Creek, Index Mining District, Snohomish County, Washington, USA
trans.png
Bornite

Sunset Mine, Trout Creek, Index Mining District, Snohomish County, Washington, USA
CuFeS2ⓘ Chalcopyrite
trans.png
Chalcopyrite, etc.

Sunset Mine, Trout Creek, Index Mining District, Snohomish County, Washington, USA
trans.png
Chalcopyrite, etc.

Merchant Mine, Trout Creek, Index Mining District, Snohomish County, Washington, USA
trans.png
Chalcopyrite, etc.

Copper Belle Mine, Reiter, Index Mining District, Snohomish County, Washington, USA
trans.png
Chalcopyrite, etc.

Sunset Mine, Trout Creek, Index Mining District, Snohomish County, Washington, USA
trans.png
Chalcopyrite, etc.

Merchant Mine, Trout Creek, Index Mining District, Snohomish County, Washington, USA
trans.png
Chalcopyrite, etc.

Copper Belle Mine, Reiter, Index Mining District, Snohomish County, Washington, USA
trans.png
Chalcopyrite, etc.

Sunset Mine, Trout Creek, Index Mining District, Snohomish County, Washington, USA
trans.png
Chalcopyrite, etc.

Merchant Mine, Trout Creek, Index Mining District, Snohomish County, Washington, USA
(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)ⓘ Epidote
trans.png
Epidote

Sunset Mine, Trout Creek, Index Mining District, Snohomish County, Washington, USA
trans.png
Epidote, etc.

Sunset Falls Railroad Cut, Index Mining District, Snohomish County, Washington, USA
trans.png
Epidote, etc.

Sunset Falls Railroad Cut, Index Mining District, Snohomish County, Washington, USA
trans.png
Epidote

Sunset Mine, Trout Creek, Index Mining District, Snohomish County, Washington, USA
trans.png
Epidote, etc.

Sunset Falls Railroad Cut, Index Mining District, Snohomish County, Washington, USA
trans.png
Epidote, etc.

Sunset Falls Railroad Cut, Index Mining District, Snohomish County, Washington, USA
trans.png
Epidote

Sunset Mine, Trout Creek, Index Mining District, Snohomish County, Washington, USA
trans.png
Epidote, etc.

Sunset Falls Railroad Cut, Index Mining District, Snohomish County, Washington, USA
MoS2ⓘ Molybdenite
trans.png
Molybdenite

Armament Prospect, Index Mining District, Snohomish County, Washington, USA
trans.png
Molybdenite

Armament Prospect, Index Mining District, Snohomish County, Washington, USA
trans.png
Molybdenite, etc.

Armament Prospect, Index Mining District, Snohomish County, Washington, USA
trans.png
Molybdenite

Armament Prospect, Index Mining District, Snohomish County, Washington, USA
trans.png
Molybdenite

Armament Prospect, Index Mining District, Snohomish County, Washington, USA
trans.png
Molybdenite, etc.

Armament Prospect, Index Mining District, Snohomish County, Washington, USA
trans.png
Molybdenite

Armament Prospect, Index Mining District, Snohomish County, Washington, USA
trans.png
Molybdenite

Armament Prospect, Index Mining District, Snohomish County, Washington, USA
As4S4ⓘ Realgar
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Realgar

American Arsenic Mine, Reiter, Index Mining District, Snohomish County, Washington, USA
trans.png
Realgar

American Arsenic Mine, Reiter, Index Mining District, Snohomish County, Washington, USA
trans.png
Realgar

American Arsenic Mine, Reiter, Index Mining District, Snohomish County, Washington, USA

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
ⓘNative Copper1.AA.05Cu
ⓘNative Gold1.AA.05Au
ⓘNative Silver1.AA.05Ag
Group 2 - Sulphides and Sulfosalts
ⓘChalcocite2.BA.05Cu2S
ⓘBornite2.BA.15Cu5FeS4
ⓘCovellite2.CA.05aCuS
ⓘSphalerite2.CB.05aZnS
ⓘChalcopyrite2.CB.10aCuFeS2
ⓘMolybdenite2.EA.30MoS2
ⓘPyrite2.EB.05aFeS2
ⓘMarcasite2.EB.10aFeS2
ⓘRealgar2.FA.15aAs4S4
ⓘOrpiment2.FA.30As2S3
Group 3 - Halides
ⓘFluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
ⓘCuprite4.AA.10Cu2O
ⓘMagnetite4.BB.05Fe2+Fe3+2O4
ⓘHematite4.CB.05Fe2O3
ⓘArsenolite4.CB.50As2O3
ⓘQuartz
var. Amethyst		4.DA.05SiO2
ⓘ4.DA.05SiO2
ⓘvar. Rock Crystal4.DA.05SiO2
ⓘUraninite4.DL.05UO2
ⓘMolybdite4.E0.10MoO3
Group 5 - Nitrates and Carbonates
ⓘCalcite5.AB.05CaCO3
ⓘAzurite5.BA.05Cu3(CO3)2(OH)2
ⓘMalachite5.BA.10Cu2(CO3)(OH)2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
ⓘCelestine7.AD.35SrSO4
ⓘScheelite7.GA.05Ca(WO4)
Group 9 - Silicates
ⓘAlmandine9.AD.25Fe2+3Al2(SiO4)3
ⓘGrossular9.AD.25Ca3Al2(SiO4)3
ⓘAndalusite9.AF.10Al2(SiO4)O
ⓘStaurolite9.AF.30Fe2+2Al9Si4O23(OH)
ⓘTitanite9.AG.15CaTiO(SiO4)
ⓘEpidote9.BG.05a(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
ⓘDiopside9.DA.15CaMgSi2O6
ⓘCummingtonite9.DE.05◻Mg2Mg5(Si8O22)(OH)2
ⓘActinolite9.DE.10◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
ⓘPrehnite9.DP.20Ca2Al2Si3O10(OH)2
ⓘTalc9.EC.05Mg3Si4O10(OH)2
ⓘMuscovite9.EC.15KAl2(AlSi3O10)(OH)2
ⓘPennantite9.EC.55Mn2+5Al(AlSi3O10)(OH)8
ⓘKaolinite9.ED.05Al2(Si2O5)(OH)4
ⓘStilpnomelane9.EG.40K4Fe2+48[Si64Al8]O164(OH)52 · nH2O
ⓘMicrocline9.FA.30K(AlSi3O8)
ⓘAlbite9.FA.35Na(AlSi3O8)
ⓘAnorthite9.FA.35Ca(Al2Si2O8)
ⓘvar. Bytownite9.FA.35(Ca,Na)[Al(Al,Si)Si2O8]
Unclassified
ⓘ'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
ⓘ'Chlorite Group'-
ⓘ'Calcium Amphibole Subgroup
var. Hornblende'		-AnCa2(Z2+5-mZ3+m)(Si8-(n+m)Al(n+m))(OH,F,Cl)2
ⓘ'Pumpellyite Subgroup'-Ca2XAl2[Si2O6(OH)][SiO4](OH)2A
ⓘ'Stilbite Subgroup'-M6-7[Al8-9Si27-28O72] · nH2O
ⓘ'Tourmaline'-AD3G6(T6O18)(BO3)3X3Z
ⓘ'Hornblende Root Name Group'-◻Ca2(C2+4C3+)(AlSi7O22)W2
ⓘ'Garnet Group'-X3Z2(SiO4)3
ⓘ'Serpentine Subgroup'-D3[Si2O5](OH)4
ⓘ'Apatite'-Ca5(PO4)3A
ⓘ'Calcium Amphibole Subgroup'-AnCa2(C2+5-mC3+m)(Si8-(n+m)Al(n+m))W2

List of minerals for each chemical element

HHydrogen
Hⓘ Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Hⓘ AzuriteCu3(CO3)2(OH)2
Hⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Hⓘ Cummingtonite◻Mg2Mg5(Si8O22)(OH)2
Hⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Hⓘ Calcium Amphibole Subgroup var. HornblendeAnCa2(Z2+5-mZm3+)(Si8-(n+m)Al(n+m))(OH,F,Cl)2
Hⓘ KaoliniteAl2(Si2O5)(OH)4
Hⓘ MalachiteCu2(CO3)(OH)2
Hⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Hⓘ PennantiteMn52+Al(AlSi3O10)(OH)8
Hⓘ PrehniteCa2Al2Si3O10(OH)2
Hⓘ Pumpellyite SubgroupCa2XAl2[Si2O6(OH)][SiO4](OH)2A
Hⓘ StauroliteFe22+Al9Si4O23(OH)
Hⓘ Stilbite SubgroupM6-7[Al8-9Si27-28O72] · nH2O
Hⓘ StilpnomelaneK4Fe482+[Si64Al8]O164(OH)52 · nH2O
Hⓘ TalcMg3Si4O10(OH)2
Hⓘ Serpentine SubgroupD3[Si2O5](OH)4
BBoron
Bⓘ TourmalineAD3G6(T6O18)(BO3)3X3Z
CCarbon
Cⓘ AzuriteCu3(CO3)2(OH)2
Cⓘ CalciteCaCO3
Cⓘ MalachiteCu2(CO3)(OH)2
OOxygen
Oⓘ Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Oⓘ AlbiteNa(AlSi3O8)
Oⓘ Quartz var. AmethystSiO2
Oⓘ AndalusiteAl2(SiO4)O
Oⓘ AnorthiteCa(Al2Si2O8)
Oⓘ ArsenoliteAs2O3
Oⓘ AzuriteCu3(CO3)2(OH)2
Oⓘ AlmandineFe32+Al2(SiO4)3
Oⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Oⓘ Anorthite var. Bytownite(Ca,Na)[Al(Al,Si)Si2O8]
Oⓘ CalciteCaCO3
Oⓘ CelestineSrSO4
Oⓘ Cummingtonite◻Mg2Mg5(Si8O22)(OH)2
Oⓘ CupriteCu2O
Oⓘ DiopsideCaMgSi2O6
Oⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Oⓘ GrossularCa3Al2(SiO4)3
Oⓘ HematiteFe2O3
Oⓘ Calcium Amphibole Subgroup var. HornblendeAnCa2(Z2+5-mZm3+)(Si8-(n+m)Al(n+m))(OH,F,Cl)2
Oⓘ KaoliniteAl2(Si2O5)(OH)4
Oⓘ MagnetiteFe2+Fe23+O4
Oⓘ MalachiteCu2(CO3)(OH)2
Oⓘ MicroclineK(AlSi3O8)
Oⓘ MolybditeMoO3
Oⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Oⓘ PennantiteMn52+Al(AlSi3O10)(OH)8
Oⓘ PrehniteCa2Al2Si3O10(OH)2
Oⓘ Pumpellyite SubgroupCa2XAl2[Si2O6(OH)][SiO4](OH)2A
Oⓘ QuartzSiO2
Oⓘ ScheeliteCa(WO4)
Oⓘ StauroliteFe22+Al9Si4O23(OH)
Oⓘ Stilbite SubgroupM6-7[Al8-9Si27-28O72] · nH2O
Oⓘ StilpnomelaneK4Fe482+[Si64Al8]O164(OH)52 · nH2O
Oⓘ TalcMg3Si4O10(OH)2
Oⓘ TitaniteCaTiO(SiO4)
Oⓘ TourmalineAD3G6(T6O18)(BO3)3X3Z
Oⓘ UraniniteUO2
Oⓘ Quartz var. Rock CrystalSiO2
Oⓘ Hornblende Root Name Group◻Ca2(C42+C3+)(AlSi7O22)W2
Oⓘ Garnet GroupX3Z2(SiO4)3
Oⓘ Serpentine SubgroupD3[Si2O5](OH)4
Oⓘ ApatiteCa5(PO4)3A
FFluorine
Fⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Fⓘ FluoriteCaF2
Fⓘ Calcium Amphibole Subgroup var. HornblendeAnCa2(Z2+5-mZm3+)(Si8-(n+m)Al(n+m))(OH,F,Cl)2
NaSodium
Naⓘ AlbiteNa(AlSi3O8)
Naⓘ Anorthite var. Bytownite(Ca,Na)[Al(Al,Si)Si2O8]
MgMagnesium
Mgⓘ Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Mgⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Mgⓘ Cummingtonite◻Mg2Mg5(Si8O22)(OH)2
Mgⓘ DiopsideCaMgSi2O6
Mgⓘ TalcMg3Si4O10(OH)2
AlAluminium
Alⓘ AlbiteNa(AlSi3O8)
Alⓘ AndalusiteAl2(SiO4)O
Alⓘ AnorthiteCa(Al2Si2O8)
Alⓘ AlmandineFe32+Al2(SiO4)3
Alⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Alⓘ Anorthite var. Bytownite(Ca,Na)[Al(Al,Si)Si2O8]
Alⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Alⓘ GrossularCa3Al2(SiO4)3
Alⓘ Calcium Amphibole Subgroup var. HornblendeAnCa2(Z2+5-mZm3+)(Si8-(n+m)Al(n+m))(OH,F,Cl)2
Alⓘ KaoliniteAl2(Si2O5)(OH)4
Alⓘ MicroclineK(AlSi3O8)
Alⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Alⓘ PennantiteMn52+Al(AlSi3O10)(OH)8
Alⓘ PrehniteCa2Al2Si3O10(OH)2
Alⓘ Pumpellyite SubgroupCa2XAl2[Si2O6(OH)][SiO4](OH)2A
Alⓘ StauroliteFe22+Al9Si4O23(OH)
Alⓘ Stilbite SubgroupM6-7[Al8-9Si27-28O72] · nH2O
Alⓘ StilpnomelaneK4Fe482+[Si64Al8]O164(OH)52 · nH2O
Alⓘ Hornblende Root Name Group◻Ca2(C42+C3+)(AlSi7O22)W2
Alⓘ Calcium Amphibole SubgroupAnCa2(C2+5-mCm3+)(Si8-(n+m)Al(n+m))W2
SiSilicon
Siⓘ Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Siⓘ AlbiteNa(AlSi3O8)
Siⓘ Quartz var. AmethystSiO2
Siⓘ AndalusiteAl2(SiO4)O
Siⓘ AnorthiteCa(Al2Si2O8)
Siⓘ AlmandineFe32+Al2(SiO4)3
Siⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Siⓘ Anorthite var. Bytownite(Ca,Na)[Al(Al,Si)Si2O8]
Siⓘ Cummingtonite◻Mg2Mg5(Si8O22)(OH)2
Siⓘ DiopsideCaMgSi2O6
Siⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Siⓘ GrossularCa3Al2(SiO4)3
Siⓘ Calcium Amphibole Subgroup var. HornblendeAnCa2(Z2+5-mZm3+)(Si8-(n+m)Al(n+m))(OH,F,Cl)2
Siⓘ KaoliniteAl2(Si2O5)(OH)4
Siⓘ MicroclineK(AlSi3O8)
Siⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Siⓘ PennantiteMn52+Al(AlSi3O10)(OH)8
Siⓘ PrehniteCa2Al2Si3O10(OH)2
Siⓘ Pumpellyite SubgroupCa2XAl2[Si2O6(OH)][SiO4](OH)2A
Siⓘ QuartzSiO2
Siⓘ StauroliteFe22+Al9Si4O23(OH)
Siⓘ Stilbite SubgroupM6-7[Al8-9Si27-28O72] · nH2O
Siⓘ StilpnomelaneK4Fe482+[Si64Al8]O164(OH)52 · nH2O
Siⓘ TalcMg3Si4O10(OH)2
Siⓘ TitaniteCaTiO(SiO4)
Siⓘ Quartz var. Rock CrystalSiO2
Siⓘ Hornblende Root Name Group◻Ca2(C42+C3+)(AlSi7O22)W2
Siⓘ Garnet GroupX3Z2(SiO4)3
Siⓘ Serpentine SubgroupD3[Si2O5](OH)4
Siⓘ Calcium Amphibole SubgroupAnCa2(C2+5-mCm3+)(Si8-(n+m)Al(n+m))W2
PPhosphorus
Pⓘ ApatiteCa5(PO4)3A
SSulfur
Sⓘ BorniteCu5FeS4
Sⓘ CelestineSrSO4
Sⓘ ChalcopyriteCuFeS2
Sⓘ ChalcociteCu2S
Sⓘ CovelliteCuS
Sⓘ MarcasiteFeS2
Sⓘ MolybdeniteMoS2
Sⓘ OrpimentAs2S3
Sⓘ PyriteFeS2
Sⓘ RealgarAs4S4
Sⓘ SphaleriteZnS
ClChlorine
Clⓘ Calcium Amphibole Subgroup var. HornblendeAnCa2(Z2+5-mZm3+)(Si8-(n+m)Al(n+m))(OH,F,Cl)2
KPotassium
Kⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Kⓘ MicroclineK(AlSi3O8)
Kⓘ MuscoviteKAl2(AlSi3O10)(OH)2
Kⓘ StilpnomelaneK4Fe482+[Si64Al8]O164(OH)52 · nH2O
CaCalcium
Caⓘ Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Caⓘ AnorthiteCa(Al2Si2O8)
Caⓘ Anorthite var. Bytownite(Ca,Na)[Al(Al,Si)Si2O8]
Caⓘ CalciteCaCO3
Caⓘ DiopsideCaMgSi2O6
Caⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Caⓘ FluoriteCaF2
Caⓘ GrossularCa3Al2(SiO4)3
Caⓘ Calcium Amphibole Subgroup var. HornblendeAnCa2(Z2+5-mZm3+)(Si8-(n+m)Al(n+m))(OH,F,Cl)2
Caⓘ PrehniteCa2Al2Si3O10(OH)2
Caⓘ Pumpellyite SubgroupCa2XAl2[Si2O6(OH)][SiO4](OH)2A
Caⓘ ScheeliteCa(WO4)
Caⓘ TitaniteCaTiO(SiO4)
Caⓘ Hornblende Root Name Group◻Ca2(C42+C3+)(AlSi7O22)W2
Caⓘ ApatiteCa5(PO4)3A
Caⓘ Calcium Amphibole SubgroupAnCa2(C2+5-mCm3+)(Si8-(n+m)Al(n+m))W2
TiTitanium
Tiⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Tiⓘ TitaniteCaTiO(SiO4)
MnManganese
Mnⓘ PennantiteMn52+Al(AlSi3O10)(OH)8
FeIron
Feⓘ Actinolite◻Ca2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2
Feⓘ AlmandineFe32+Al2(SiO4)3
Feⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Feⓘ BorniteCu5FeS4
Feⓘ ChalcopyriteCuFeS2
Feⓘ Epidote(CaCa)(AlAlFe3+)O[Si2O7][SiO4](OH)
Feⓘ HematiteFe2O3
Feⓘ MagnetiteFe2+Fe23+O4
Feⓘ MarcasiteFeS2
Feⓘ PyriteFeS2
Feⓘ StauroliteFe22+Al9Si4O23(OH)
Feⓘ StilpnomelaneK4Fe482+[Si64Al8]O164(OH)52 · nH2O
CuCopper
Cuⓘ AzuriteCu3(CO3)2(OH)2
Cuⓘ BorniteCu5FeS4
Cuⓘ ChalcopyriteCuFeS2
Cuⓘ ChalcociteCu2S
Cuⓘ CovelliteCuS
Cuⓘ CupriteCu2O
Cuⓘ Native CopperCu
Cuⓘ MalachiteCu2(CO3)(OH)2
ZnZinc
Znⓘ SphaleriteZnS
AsArsenic
Asⓘ ArsenoliteAs2O3
Asⓘ OrpimentAs2S3
Asⓘ RealgarAs4S4
SrStrontium
Srⓘ CelestineSrSO4
MoMolybdenum
Moⓘ MolybdeniteMoS2
Moⓘ MolybditeMoO3
AgSilver
Agⓘ Native SilverAg
WTungsten
Wⓘ ScheeliteCa(WO4)
AuGold
Auⓘ Native GoldAu
UUranium
Uⓘ UraniniteUO2

Fossils

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Localities in this Region

USA
USA

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References

Adair, J.B. (1907) Index Mining District, Wash. Northwest Mining Journal Volume 4 No. 4
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