Regional Level Types | |
---|---|
Yogo District | Mining District |
Little Belt Mountains | Mountain Range |
Judith Basin County | County |
Montana | State |
USA | Country |
ⓘAegirine Formula:NaFe3+Si2O6 |
ⓘ'Amphibole Supergroup' Formula:AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
ⓘAnalcime Formula:Na(AlSi2O6) · H2O |
ⓘAnkerite Formula:Ca(Fe2+,Mg)(CO3)2 |
ⓘ'Apatite' Formula:Ca5(PO4)3(Cl/F/OH) |
ⓘAugite Formula:(CaxMgyFez)(Mgy1Fez1)Si2O6 |
ⓘBaryte Formula:BaSO4 |
ⓘ'Biotite' Formula:K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 Locality:Yogo Peak intrusion, Yogo District, Little Belt Mountains, Judith Basin County, Montana, USA References: |
ⓘCalcite Formula:CaCO3 |
ⓘ'Chlorite Group' |
ⓘ'Clinopyroxene Subgroup' Locality:Yogo Peak intrusion, Yogo District, Little Belt Mountains, Judith Basin County, Montana, USA References: |
ⓘCorundum Formula:Al2O3 References: |
ⓘCorundum var. Sapphire Formula:Al2O3 Habit: up to 15mm Colour: Bright blue Description: Blue (Fe2+/Ti4+ charge transfer) or purple (Cr).Xenolithic. References: |
ⓘDiopside Formula:CaMgSi2O6 |
ⓘDolomite Formula:CaMg(CO3)2 |
ⓘForsterite Formula:Mg2SiO4 Locality:Yogo Peak intrusion, Yogo District, Little Belt Mountains, Judith Basin County, Montana, USA References: |
ⓘGold Formula:Au |
ⓘHematite Formula:Fe2O3 |
ⓘ'Hornblende Root Name Group' Formula:◻Ca2(Z2+4Z3+)(AlSi7O22)(OH,F,Cl)2 |
ⓘMagnetite Formula:Fe2+Fe3+2O4 Description: With Al-rich rims.Rims pleonaste. |
ⓘMicrocline Formula:K(AlSi3O8) Locality:Yogo Peak intrusion, Yogo District, Little Belt Mountains, Judith Basin County, Montana, USA References: |
ⓘNepheline Formula:Na3K(Al4Si4O16) Locality:Yogo Peak intrusion, Yogo District, Little Belt Mountains, Judith Basin County, Montana, USA References: |
ⓘ'Orthopyroxene Subgroup' Locality:Yogo Peak intrusion, Yogo District, Little Belt Mountains, Judith Basin County, Montana, USA References: |
ⓘPhlogopite Formula:KMg3(AlSi3O10)(OH)2 Description: Mg-rich core.Fe/Ba-rich rims. |
ⓘ'Plagioclase' Formula:(Na,Ca)[(Si,Al)AlSi2]O8 Description: In pyrope-cpx-plagioclase granulite xenolith. |
ⓘPyrite Formula:FeS2 |
ⓘPyrope Formula:Mg3Al2(SiO4)3 Description: In pyrope-cpx-plagioclase granulite xenolith. |
ⓘ'Serpentine Subgroup' Formula:D3[Si2O5](OH)4 |
ⓘSpinel Formula:MgAl2O4 Description: Rims sapphire.Mixture of Al-rich material with the Yogo magma. |
ⓘSpinel var. Pleonaste Formula:(Mg,Fe)Al2O4 Description: Rims sapphire.Mixture of Al-rich material with the Yogo magma. |
ⓘZircon Formula:Zr(SiO4) |
Group 1 - Elements | |||
---|---|---|---|
ⓘ | Gold | 1.AA.05 | Au |
Group 2 - Sulphides and Sulfosalts | |||
ⓘ | Pyrite | 2.EB.05a | FeS2 |
Group 4 - Oxides and Hydroxides | |||
ⓘ | Magnetite | 4.BB.05 | Fe2+Fe3+2O4 |
ⓘ | Spinel | 4.BB.05 | MgAl2O4 |
ⓘ | var. Pleonaste | 4.BB.05 | (Mg,Fe)Al2O4 |
ⓘ | Corundum | 4.CB.05 | Al2O3 |
ⓘ | Hematite | 4.CB.05 | Fe2O3 |
ⓘ | Corundum var. Sapphire | 4.CB.05 | Al2O3 |
Group 5 - Nitrates and Carbonates | |||
ⓘ | Calcite | 5.AB.05 | CaCO3 |
ⓘ | Ankerite | 5.AB.10 | Ca(Fe2+,Mg)(CO3)2 |
ⓘ | Dolomite | 5.AB.10 | CaMg(CO3)2 |
Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
ⓘ | Baryte | 7.AD.35 | BaSO4 |
Group 9 - Silicates | |||
ⓘ | Forsterite | 9.AC.05 | Mg2SiO4 |
ⓘ | Pyrope | 9.AD.25 | Mg3Al2(SiO4)3 |
ⓘ | Zircon | 9.AD.30 | Zr(SiO4) |
ⓘ | Augite | 9.DA.15 | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
ⓘ | Diopside | 9.DA.15 | CaMgSi2O6 |
ⓘ | Aegirine | 9.DA.25 | NaFe3+Si2O6 |
ⓘ | Phlogopite | 9.EC.20 | KMg3(AlSi3O10)(OH)2 |
ⓘ | Nepheline | 9.FA.05 | Na3K(Al4Si4O16) |
ⓘ | Microcline | 9.FA.30 | K(AlSi3O8) |
ⓘ | Analcime | 9.GB.05 | Na(AlSi2O6) · H2O |
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' | - | |
ⓘ | 'Clinopyroxene Subgroup' | - | |
ⓘ | 'Hornblende Root Name Group' | - | ◻Ca2(Z2+4Z3+)(AlSi7O22)(OH,F,Cl)2 |
ⓘ | 'Plagioclase' | - | (Na,Ca)[(Si,Al)AlSi2]O8 |
ⓘ | 'Orthopyroxene Subgroup' | - | |
ⓘ | 'Serpentine Subgroup' | - | D3[Si2O5](OH)4 |
ⓘ | 'Apatite' | - | Ca5(PO4)3(Cl/F/OH) |
H | Hydrogen | |
---|---|---|
H | ⓘAmphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
H | ⓘAnalcime | Na(AlSi2O6) · H2O |
H | ⓘBiotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
H | ⓘPhlogopite | KMg3(AlSi3O10)(OH)2 |
H | ⓘHornblende Root Name Group | ◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2 |
H | ⓘSerpentine Subgroup | D3[Si2O5](OH)4 |
H | ⓘApatite | Ca5(PO4)3(Cl/F/OH) |
C | Carbon | |
C | ⓘAnkerite | Ca(Fe2+,Mg)(CO3)2 |
C | ⓘCalcite | CaCO3 |
C | ⓘDolomite | CaMg(CO3)2 |
O | Oxygen | |
O | ⓘAegirine | NaFe3+Si2O6 |
O | ⓘAmphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
O | ⓘAnalcime | Na(AlSi2O6) · H2O |
O | ⓘAnkerite | Ca(Fe2+,Mg)(CO3)2 |
O | ⓘAugite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
O | ⓘBaryte | BaSO4 |
O | ⓘBiotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
O | ⓘCalcite | CaCO3 |
O | ⓘCorundum | Al2O3 |
O | ⓘDiopside | CaMgSi2O6 |
O | ⓘDolomite | CaMg(CO3)2 |
O | ⓘForsterite | Mg2SiO4 |
O | ⓘHematite | Fe2O3 |
O | ⓘMagnetite | Fe2+Fe23+O4 |
O | ⓘMicrocline | K(AlSi3O8) |
O | ⓘNepheline | Na3K(Al4Si4O16) |
O | ⓘPhlogopite | KMg3(AlSi3O10)(OH)2 |
O | ⓘPyrope | Mg3Al2(SiO4)3 |
O | ⓘCorundum var.Sapphire | Al2O3 |
O | ⓘSpinel | MgAl2O4 |
O | ⓘZircon | Zr(SiO4) |
O | ⓘSpinel var.Pleonaste | (Mg,Fe)Al2O4 |
O | ⓘHornblende Root Name Group | ◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2 |
O | ⓘPlagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
O | ⓘSerpentine Subgroup | D3[Si2O5](OH)4 |
O | ⓘApatite | Ca5(PO4)3(Cl/F/OH) |
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 |
F | ⓘHornblende Root Name Group | ◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2 |
F | ⓘApatite | Ca5(PO4)3(Cl/F/OH) |
Na | Sodium | |
Na | ⓘAegirine | NaFe3+Si2O6 |
Na | ⓘAnalcime | Na(AlSi2O6) · H2O |
Na | ⓘNepheline | Na3K(Al4Si4O16) |
Na | ⓘPlagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
Mg | Magnesium | |
Mg | ⓘAnkerite | Ca(Fe2+,Mg)(CO3)2 |
Mg | ⓘAugite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
Mg | ⓘBiotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
Mg | ⓘDiopside | CaMgSi2O6 |
Mg | ⓘDolomite | CaMg(CO3)2 |
Mg | ⓘForsterite | Mg2SiO4 |
Mg | ⓘPhlogopite | KMg3(AlSi3O10)(OH)2 |
Mg | ⓘPyrope | Mg3Al2(SiO4)3 |
Mg | ⓘSpinel | MgAl2O4 |
Mg | ⓘSpinel var.Pleonaste | (Mg,Fe)Al2O4 |
Al | Aluminium | |
Al | ⓘAmphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
Al | ⓘAnalcime | Na(AlSi2O6) · H2O |
Al | ⓘBiotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
Al | ⓘCorundum | Al2O3 |
Al | ⓘMicrocline | K(AlSi3O8) |
Al | ⓘNepheline | Na3K(Al4Si4O16) |
Al | ⓘPhlogopite | KMg3(AlSi3O10)(OH)2 |
Al | ⓘPyrope | Mg3Al2(SiO4)3 |
Al | ⓘCorundum var.Sapphire | Al2O3 |
Al | ⓘSpinel | MgAl2O4 |
Al | ⓘSpinel var.Pleonaste | (Mg,Fe)Al2O4 |
Al | ⓘHornblende Root Name Group | ◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2 |
Al | ⓘPlagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
Si | Silicon | |
Si | ⓘAegirine | NaFe3+Si2O6 |
Si | ⓘAmphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
Si | ⓘAnalcime | Na(AlSi2O6) · H2O |
Si | ⓘAugite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
Si | ⓘBiotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
Si | ⓘDiopside | CaMgSi2O6 |
Si | ⓘForsterite | Mg2SiO4 |
Si | ⓘMicrocline | K(AlSi3O8) |
Si | ⓘNepheline | Na3K(Al4Si4O16) |
Si | ⓘPhlogopite | KMg3(AlSi3O10)(OH)2 |
Si | ⓘPyrope | Mg3Al2(SiO4)3 |
Si | ⓘZircon | Zr(SiO4) |
Si | ⓘHornblende Root Name Group | ◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2 |
Si | ⓘPlagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
Si | ⓘSerpentine Subgroup | D3[Si2O5](OH)4 |
P | Phosphorus | |
P | ⓘApatite | Ca5(PO4)3(Cl/F/OH) |
S | Sulfur | |
S | ⓘBaryte | BaSO4 |
S | ⓘPyrite | FeS2 |
Cl | Chlorine | |
Cl | ⓘAmphibole Supergroup | AB2C5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 |
Cl | ⓘHornblende Root Name Group | ◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2 |
Cl | ⓘApatite | Ca5(PO4)3(Cl/F/OH) |
K | Potassium | |
K | ⓘBiotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
K | ⓘMicrocline | K(AlSi3O8) |
K | ⓘNepheline | Na3K(Al4Si4O16) |
K | ⓘPhlogopite | KMg3(AlSi3O10)(OH)2 |
Ca | Calcium | |
Ca | ⓘAnkerite | Ca(Fe2+,Mg)(CO3)2 |
Ca | ⓘAugite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
Ca | ⓘCalcite | CaCO3 |
Ca | ⓘDiopside | CaMgSi2O6 |
Ca | ⓘDolomite | CaMg(CO3)2 |
Ca | ⓘHornblende Root Name Group | ◻Ca2(Z42+Z3+)(AlSi7O22)(OH,F,Cl)2 |
Ca | ⓘPlagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
Ca | ⓘApatite | Ca5(PO4)3(Cl/F/OH) |
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 | ⓘAegirine | NaFe3+Si2O6 |
Fe | ⓘAnkerite | Ca(Fe2+,Mg)(CO3)2 |
Fe | ⓘAugite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
Fe | ⓘBiotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
Fe | ⓘHematite | Fe2O3 |
Fe | ⓘMagnetite | Fe2+Fe23+O4 |
Fe | ⓘPyrite | FeS2 |
Fe | ⓘSpinel var.Pleonaste | (Mg,Fe)Al2O4 |
Zr | Zirconium | |
Zr | ⓘZircon | Zr(SiO4) |
Ba | Barium | |
Ba | ⓘBaryte | BaSO4 |
Au | Gold | |
Au | ⓘGold | Au |
Occurrences | 61 | |||||||||
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Youngest Fossil Listed | 299 Ma (Carboniferous) | |||||||||
Oldest Fossil Listed | 359 Ma (Late/Upper Devonian) | |||||||||
Stratigraphic Units |
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Fossils from Region | Click here to show the list. | |||||||||
Fossil Localities | Click to show 2 fossil localities |