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Highwood Mountains, Chouteau County, Montana, USAi
Regional Level Types
Highwood MountainsMountain Range
Chouteau CountyCounty
MontanaState
USACountry

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Latitude & Longitude (WGS84):
47° 27' 47'' North , 110° 33' 38'' West
Latitude & Longitude (decimal):
47.46306,-110.56083
GRN:
N32W55
Type:
Mountain Range
Köppen climate type:
BSk : Cold semi-arid (steppe) climate
Mindat Locality ID:
31319
Long-form identifier:
mindat:1:2:31319:2
GUID (UUID V4):
0


The Highwood Mountains are an island range (sub-range of the Rockies entirely surrounded by prairie) which cover approximately 4,659 km² (1,799 sq mi) of north central Montana in the U.S. They are in Chouteau, Judith Basin and Cascade counties and lie east of Great Falls and Benton Lake National Wildlife Refuge, at the northern end of the Lewis and Clark National Forest. The mountains were included in Highwood Mountains National Forest until 1908 when the unit became part of Lewis and Clark National Forest.

Nearby are Highwood, Montana and the Missouri River above the mouth of the Marias River. The highest point in the Highwood Mountains is Highwood Baldy at 2338 meters (7670 ft).

The area has volcanic origins and is rich in potash. Many of the extrusive rocks and some of the dike rocks contain abundant phenocrysts of a clear analcime that appears to be primary. Pseudoleucite is an abundant constituent of many of the igneous rocks. The Shonkin Sag, a glacial meltwater channel, borders the Highwood Mountains to the north.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List

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

31 valid minerals.

Rock Types Recorded

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

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

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

ⓘ Aegirine
Formula: NaFe3+Si2O6
ⓘ Analcime
Formula: Na(AlSi2O6) · H2O
ⓘ Andradite
Formula: Ca3Fe3+2(SiO4)3
ⓘ Andradite var. Melanite
Formula: Ca3Fe3+2(SiO4)3
ⓘ Annite
Formula: KFe2+3(AlSi3O10)(OH)2
ⓘ 'Apatite'
Formula: Ca5(PO4)3(Cl/F/OH)
ⓘ Arfvedsonite
Formula: [Na][Na2][Fe2+4Fe3+]Si8O22(OH)2
ⓘ Augite
Formula: (CaxMgyFez)(Mgy1Fez1)Si2O6
ⓘ Baryte
Formula: BaSO4
ⓘ Barytolamprophyllite
Formula: (Ba,Na)2(Na,Ti,Fe3+)4Ti2(Si2O7)2O(OH,F)
ⓘ 'Biotite'
Formula: K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
ⓘ 'Britholite Group'
Formula: (REE,Ca)5[(Si,P)O4]3X
ⓘ Calcite
Formula: CaCO3
ⓘ 'Chabazite'
ⓘ Chromite
Formula: Fe2+Cr3+2O4
ⓘ 'Clinopyroxene Subgroup'
ⓘ Diopside
Formula: CaMgSi2O6
ⓘ Diopside var. Salite
Formula: CaMgSi2O6
ⓘ 'Fayalite-Forsterite Series'
ⓘ 'Feldspathoid'
ⓘ Fluorapatite
Formula: Ca5(PO4)3F
ⓘ Fluorite
Formula: CaF2
ⓘ Forsterite
Formula: Mg2(SiO4)
ⓘ 'Garnet Group'
Formula: X3Z2(SiO4)3
ⓘ Hematite
Formula: Fe2O3
ⓘ Kalborsite
Formula: K6Al4BSi6O20(OH)4Cl
ⓘ Kalsilite
Formula: KAlSiO4
ⓘ Leucite
Formula: K(AlSi2O6)
ⓘ Magnetite
Formula: Fe2+Fe3+2O4
ⓘ Magnetite var. Titanium-bearing Magnetite
Formula: Fe2+(Fe3+,Ti)2O4
ⓘ Natrolite
Formula: Na2Al2Si3O10 · 2H2O
ⓘ Nepheline
Formula: Na3K(Al4Si4O16)
Description: altered to natrolite and stilbite
ⓘ Orthoclase
Formula: K(AlSi3O8)
ⓘ Phlogopite
Formula: KMg3(AlSi3O10)(OH)2
ⓘ Phlogopite var. Barium-bearing phlogopite
Formula: (K,Ba)1-xMg3(AlSi3O10)(OH,F)2
ⓘ Pitiglianoite
Formula: Na6K2(Al6Si6O24)(SO4) · 2H2O
ⓘ 'Pseudoleucite'
ⓘ Pyrite
Formula: FeS2
ⓘ Pyrrhotite
Formula: Fe1-xS
ⓘ Sanidine
Formula: K(AlSi3O8)
ⓘ Shcherbakovite
Formula: (K,Ba)KNa(Ti,Nb)2(Si4O12)O2
ⓘ Sodalite
Formula: Na4(Si3Al3)O12Cl
ⓘ 'Stilbite Subgroup'
Formula: M6-7[Al8-9Si27-28O72] · nH2O
ⓘ Titanite
Formula: CaTi(SiO4)O
ⓘ Wadeite
Formula: K2Zr(Si3O9)

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
ⓘPyrrhotite2.CC.10Fe1-xS
ⓘPyrite2.EB.05aFeS2
Group 3 - Halides
ⓘFluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
ⓘChromite4.BB.05Fe2+Cr3+2O4
ⓘMagnetite4.BB.05Fe2+Fe3+2O4
ⓘvar. Titanium-bearing Magnetite4.BB.05Fe2+(Fe3+,Ti)2O4
ⓘHematite4.CB.05Fe2O3
Group 5 - Nitrates and Carbonates
ⓘCalcite5.AB.05CaCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
ⓘBaryte7.AD.35BaSO4
Group 8 - Phosphates, Arsenates and Vanadates
ⓘFluorapatite8.BN.05Ca5(PO4)3F
Group 9 - Silicates
ⓘForsterite9.AC.05Mg2(SiO4)
ⓘAndradite9.AD.25Ca3Fe3+2(SiO4)3
ⓘvar. Melanite9.AD.25Ca3Fe3+2(SiO4)3
ⓘTitanite9.AG.15CaTi(SiO4)O
ⓘBarytolamprophyllite9.BE.25(Ba,Na)2(Na,Ti,Fe3+)4Ti2(Si2O7)2O(OH,F)
ⓘWadeite9.CA.10K2Zr(Si3O9)
ⓘAugite9.DA.15(CaxMgyFez)(Mgy1Fez1)Si2O6
ⓘDiopside9.DA.15CaMgSi2O6
ⓘvar. Salite9.DA.15CaMgSi2O6
ⓘAegirine9.DA.25NaFe3+Si2O6
ⓘArfvedsonite9.DE.25[Na][Na2][Fe2+4Fe3+]Si8O22(OH)2
ⓘShcherbakovite9.DH.20(K,Ba)KNa(Ti,Nb)2(Si4O12)O2
ⓘAnnite9.EC.20KFe2+3(AlSi3O10)(OH)2
ⓘPhlogopite
var. Barium-bearing phlogopite		9.EC.20(K,Ba)1-xMg3(AlSi3O10)(OH,F)2
ⓘ9.EC.20KMg3(AlSi3O10)(OH)2
ⓘKalsilite9.FA.05KAlSiO4
ⓘNepheline9.FA.05Na3K(Al4Si4O16)
ⓘOrthoclase9.FA.30K(AlSi3O8)
ⓘSanidine9.FA.30K(AlSi3O8)
ⓘPitiglianoite9.FB.05Na6K2(Al6Si6O24)(SO4) · 2H2O
ⓘSodalite9.FB.10Na4(Si3Al3)O12Cl
ⓘNatrolite9.GA.05Na2Al2Si3O10 · 2H2O
ⓘKalborsite9.GA.15K6Al4BSi6O20(OH)4Cl
ⓘAnalcime9.GB.05Na(AlSi2O6) · H2O
ⓘLeucite9.GB.05K(AlSi2O6)
Unclassified
ⓘ'Biotite'-K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
ⓘ'Chabazite'-
ⓘ'Stilbite Subgroup'-M6-7[Al8-9Si27-28O72] · nH2O
ⓘ'Clinopyroxene Subgroup'-
ⓘ'Fayalite-Forsterite Series'-
ⓘ'Garnet Group'-X3Z2(SiO4)3
ⓘ'Apatite'-Ca5(PO4)3(Cl/F/OH)
ⓘ'Britholite Group'-(REE,Ca)5[(Si,P)O4]3X
ⓘ'Pseudoleucite'-
ⓘ'Feldspathoid'-

List of minerals for each chemical element

HHydrogen
Hⓘ AnalcimeNa(AlSi2O6) · H2O
Hⓘ AnniteKFe32+(AlSi3O10)(OH)2
Hⓘ Arfvedsonite[Na][Na2][Fe42+Fe3+]Si8O22(OH)2
Hⓘ Barytolamprophyllite(Ba,Na)2(Na,Ti,Fe3+)4Ti2(Si2O7)2O(OH,F)
Hⓘ Phlogopite var. Barium-bearing phlogopite(K,Ba)1-xMg3(AlSi3O10)(OH,F)2
Hⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Hⓘ KalborsiteK6Al4BSi6O20(OH)4Cl
Hⓘ NatroliteNa2Al2Si3O10 · 2H2O
Hⓘ PhlogopiteKMg3(AlSi3O10)(OH)2
Hⓘ PitiglianoiteNa6K2(Al6Si6O24)(SO4) · 2H2O
Hⓘ Stilbite SubgroupM6-7[Al8-9Si27-28O72] · nH2O
Hⓘ ApatiteCa5(PO4)3(Cl/F/OH)
BBoron
Bⓘ KalborsiteK6Al4BSi6O20(OH)4Cl
CCarbon
Cⓘ CalciteCaCO3
OOxygen
Oⓘ AegirineNaFe3+Si2O6
Oⓘ AnalcimeNa(AlSi2O6) · H2O
Oⓘ AndraditeCa3Fe23+(SiO4)3
Oⓘ AnniteKFe32+(AlSi3O10)(OH)2
Oⓘ Arfvedsonite[Na][Na2][Fe42+Fe3+]Si8O22(OH)2
Oⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Oⓘ Barytolamprophyllite(Ba,Na)2(Na,Ti,Fe3+)4Ti2(Si2O7)2O(OH,F)
Oⓘ Phlogopite var. Barium-bearing phlogopite(K,Ba)1-xMg3(AlSi3O10)(OH,F)2
Oⓘ BaryteBaSO4
Oⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Oⓘ CalciteCaCO3
Oⓘ ChromiteFe2+Cr23+O4
Oⓘ DiopsideCaMgSi2O6
Oⓘ FluorapatiteCa5(PO4)3F
Oⓘ ForsteriteMg2(SiO4)
Oⓘ HematiteFe2O3
Oⓘ KalborsiteK6Al4BSi6O20(OH)4Cl
Oⓘ KalsiliteKAlSiO4
Oⓘ LeuciteK(AlSi2O6)
Oⓘ MagnetiteFe2+Fe23+O4
Oⓘ NephelineNa3K(Al4Si4O16)
Oⓘ NatroliteNa2Al2Si3O10 · 2H2O
Oⓘ OrthoclaseK(AlSi3O8)
Oⓘ PhlogopiteKMg3(AlSi3O10)(OH)2
Oⓘ PitiglianoiteNa6K2(Al6Si6O24)(SO4) · 2H2O
Oⓘ SanidineK(AlSi3O8)
Oⓘ Shcherbakovite(K,Ba)KNa(Ti,Nb)2(Si4O12)O2
Oⓘ SodaliteNa4(Si3Al3)O12Cl
Oⓘ Stilbite SubgroupM6-7[Al8-9Si27-28O72] · nH2O
Oⓘ TitaniteCaTi(SiO4)O
Oⓘ Magnetite var. Titanium-bearing MagnetiteFe2+(Fe3+,Ti)2O4
Oⓘ WadeiteK2Zr(Si3O9)
Oⓘ Andradite var. MelaniteCa3Fe23+(SiO4)3
Oⓘ Fayalite-Forsterite Series
Oⓘ Garnet GroupX3Z2(SiO4)3
Oⓘ Diopside var. SaliteCaMgSi2O6
Oⓘ ApatiteCa5(PO4)3(Cl/F/OH)
Oⓘ Britholite Group(REE,Ca)5[(Si,P)O4]3X
FFluorine
Fⓘ Barytolamprophyllite(Ba,Na)2(Na,Ti,Fe3+)4Ti2(Si2O7)2O(OH,F)
Fⓘ Phlogopite var. Barium-bearing phlogopite(K,Ba)1-xMg3(AlSi3O10)(OH,F)2
Fⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Fⓘ FluorapatiteCa5(PO4)3F
Fⓘ FluoriteCaF2
Fⓘ ApatiteCa5(PO4)3(Cl/F/OH)
NaSodium
Naⓘ AegirineNaFe3+Si2O6
Naⓘ AnalcimeNa(AlSi2O6) · H2O
Naⓘ Arfvedsonite[Na][Na2][Fe42+Fe3+]Si8O22(OH)2
Naⓘ Barytolamprophyllite(Ba,Na)2(Na,Ti,Fe3+)4Ti2(Si2O7)2O(OH,F)
Naⓘ NephelineNa3K(Al4Si4O16)
Naⓘ NatroliteNa2Al2Si3O10 · 2H2O
Naⓘ PitiglianoiteNa6K2(Al6Si6O24)(SO4) · 2H2O
Naⓘ Shcherbakovite(K,Ba)KNa(Ti,Nb)2(Si4O12)O2
Naⓘ SodaliteNa4(Si3Al3)O12Cl
MgMagnesium
Mgⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Mgⓘ Phlogopite var. Barium-bearing phlogopite(K,Ba)1-xMg3(AlSi3O10)(OH,F)2
Mgⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Mgⓘ DiopsideCaMgSi2O6
Mgⓘ ForsteriteMg2(SiO4)
Mgⓘ PhlogopiteKMg3(AlSi3O10)(OH)2
Mgⓘ Fayalite-Forsterite Series
Mgⓘ Diopside var. SaliteCaMgSi2O6
AlAluminium
Alⓘ AnalcimeNa(AlSi2O6) · H2O
Alⓘ AnniteKFe32+(AlSi3O10)(OH)2
Alⓘ Phlogopite var. Barium-bearing phlogopite(K,Ba)1-xMg3(AlSi3O10)(OH,F)2
Alⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Alⓘ KalborsiteK6Al4BSi6O20(OH)4Cl
Alⓘ KalsiliteKAlSiO4
Alⓘ LeuciteK(AlSi2O6)
Alⓘ NephelineNa3K(Al4Si4O16)
Alⓘ NatroliteNa2Al2Si3O10 · 2H2O
Alⓘ OrthoclaseK(AlSi3O8)
Alⓘ PhlogopiteKMg3(AlSi3O10)(OH)2
Alⓘ PitiglianoiteNa6K2(Al6Si6O24)(SO4) · 2H2O
Alⓘ SanidineK(AlSi3O8)
Alⓘ SodaliteNa4(Si3Al3)O12Cl
Alⓘ Stilbite SubgroupM6-7[Al8-9Si27-28O72] · nH2O
SiSilicon
Siⓘ AegirineNaFe3+Si2O6
Siⓘ AnalcimeNa(AlSi2O6) · H2O
Siⓘ AndraditeCa3Fe23+(SiO4)3
Siⓘ AnniteKFe32+(AlSi3O10)(OH)2
Siⓘ Arfvedsonite[Na][Na2][Fe42+Fe3+]Si8O22(OH)2
Siⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Siⓘ Barytolamprophyllite(Ba,Na)2(Na,Ti,Fe3+)4Ti2(Si2O7)2O(OH,F)
Siⓘ Phlogopite var. Barium-bearing phlogopite(K,Ba)1-xMg3(AlSi3O10)(OH,F)2
Siⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Siⓘ DiopsideCaMgSi2O6
Siⓘ ForsteriteMg2(SiO4)
Siⓘ KalborsiteK6Al4BSi6O20(OH)4Cl
Siⓘ KalsiliteKAlSiO4
Siⓘ LeuciteK(AlSi2O6)
Siⓘ NephelineNa3K(Al4Si4O16)
Siⓘ NatroliteNa2Al2Si3O10 · 2H2O
Siⓘ OrthoclaseK(AlSi3O8)
Siⓘ PhlogopiteKMg3(AlSi3O10)(OH)2
Siⓘ PitiglianoiteNa6K2(Al6Si6O24)(SO4) · 2H2O
Siⓘ SanidineK(AlSi3O8)
Siⓘ Shcherbakovite(K,Ba)KNa(Ti,Nb)2(Si4O12)O2
Siⓘ SodaliteNa4(Si3Al3)O12Cl
Siⓘ Stilbite SubgroupM6-7[Al8-9Si27-28O72] · nH2O
Siⓘ TitaniteCaTi(SiO4)O
Siⓘ WadeiteK2Zr(Si3O9)
Siⓘ Andradite var. MelaniteCa3Fe23+(SiO4)3
Siⓘ Fayalite-Forsterite Series
Siⓘ Garnet GroupX3Z2(SiO4)3
Siⓘ Diopside var. SaliteCaMgSi2O6
Siⓘ Britholite Group(REE,Ca)5[(Si,P)O4]3X
PPhosphorus
Pⓘ FluorapatiteCa5(PO4)3F
Pⓘ ApatiteCa5(PO4)3(Cl/F/OH)
Pⓘ Britholite Group(REE,Ca)5[(Si,P)O4]3X
SSulfur
Sⓘ BaryteBaSO4
Sⓘ PitiglianoiteNa6K2(Al6Si6O24)(SO4) · 2H2O
Sⓘ PyriteFeS2
Sⓘ PyrrhotiteFe1-xS
ClChlorine
Clⓘ KalborsiteK6Al4BSi6O20(OH)4Cl
Clⓘ SodaliteNa4(Si3Al3)O12Cl
Clⓘ ApatiteCa5(PO4)3(Cl/F/OH)
KPotassium
Kⓘ AnniteKFe32+(AlSi3O10)(OH)2
Kⓘ Phlogopite var. Barium-bearing phlogopite(K,Ba)1-xMg3(AlSi3O10)(OH,F)2
Kⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Kⓘ KalborsiteK6Al4BSi6O20(OH)4Cl
Kⓘ KalsiliteKAlSiO4
Kⓘ LeuciteK(AlSi2O6)
Kⓘ NephelineNa3K(Al4Si4O16)
Kⓘ OrthoclaseK(AlSi3O8)
Kⓘ PhlogopiteKMg3(AlSi3O10)(OH)2
Kⓘ PitiglianoiteNa6K2(Al6Si6O24)(SO4) · 2H2O
Kⓘ SanidineK(AlSi3O8)
Kⓘ Shcherbakovite(K,Ba)KNa(Ti,Nb)2(Si4O12)O2
Kⓘ WadeiteK2Zr(Si3O9)
CaCalcium
Caⓘ AndraditeCa3Fe23+(SiO4)3
Caⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Caⓘ CalciteCaCO3
Caⓘ DiopsideCaMgSi2O6
Caⓘ FluorapatiteCa5(PO4)3F
Caⓘ FluoriteCaF2
Caⓘ TitaniteCaTi(SiO4)O
Caⓘ Andradite var. MelaniteCa3Fe23+(SiO4)3
Caⓘ Diopside var. SaliteCaMgSi2O6
Caⓘ ApatiteCa5(PO4)3(Cl/F/OH)
Caⓘ Britholite Group(REE,Ca)5[(Si,P)O4]3X
TiTitanium
Tiⓘ Barytolamprophyllite(Ba,Na)2(Na,Ti,Fe3+)4Ti2(Si2O7)2O(OH,F)
Tiⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Tiⓘ Shcherbakovite(K,Ba)KNa(Ti,Nb)2(Si4O12)O2
Tiⓘ TitaniteCaTi(SiO4)O
Tiⓘ Magnetite var. Titanium-bearing MagnetiteFe2+(Fe3+,Ti)2O4
CrChromium
Crⓘ ChromiteFe2+Cr23+O4
FeIron
Feⓘ AegirineNaFe3+Si2O6
Feⓘ AndraditeCa3Fe23+(SiO4)3
Feⓘ AnniteKFe32+(AlSi3O10)(OH)2
Feⓘ Arfvedsonite[Na][Na2][Fe42+Fe3+]Si8O22(OH)2
Feⓘ Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Feⓘ Barytolamprophyllite(Ba,Na)2(Na,Ti,Fe3+)4Ti2(Si2O7)2O(OH,F)
Feⓘ BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Feⓘ ChromiteFe2+Cr23+O4
Feⓘ HematiteFe2O3
Feⓘ MagnetiteFe2+Fe23+O4
Feⓘ PyriteFeS2
Feⓘ PyrrhotiteFe1-xS
Feⓘ Magnetite var. Titanium-bearing MagnetiteFe2+(Fe3+,Ti)2O4
Feⓘ Andradite var. MelaniteCa3Fe23+(SiO4)3
Feⓘ Fayalite-Forsterite Series
ZrZirconium
Zrⓘ WadeiteK2Zr(Si3O9)
NbNiobium
Nbⓘ Shcherbakovite(K,Ba)KNa(Ti,Nb)2(Si4O12)O2
BaBarium
Baⓘ Barytolamprophyllite(Ba,Na)2(Na,Ti,Fe3+)4Ti2(Si2O7)2O(OH,F)
Baⓘ Phlogopite var. Barium-bearing phlogopite(K,Ba)1-xMg3(AlSi3O10)(OH,F)2
Baⓘ BaryteBaSO4
Baⓘ Shcherbakovite(K,Ba)KNa(Ti,Nb)2(Si4O12)O2

Other Databases

Wikipedia:https://en.wikipedia.org/wiki/Highwood_Mountains
Wikidata ID:Q5760066

Localities in this Region

USA

Other Regions, Features and Areas containing this locality

North AmericaContinent
North America PlateTectonic Plate

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

Pirsson, L. V., (1905) Petrography and geology of the igneous rocks of the Highwood Mountains, Montana U.S. Geological Survey Bulletin 237, 208 p
Larsen, Esper S., Buie, Bennett F. (1938) Potash analcime and pseudoleucite from the Highwood Mountains of Montana. American Mineralogist, 23 (11) 837-850
O’Brien, H.E., (1988) Petrogenesis of the Potassic Mafic Rocks of the Highwood Mountains, Montana. Ph.D. Thesis, University of Washington, Seattle, USA
McCallum, I.S., O'Brien, H.E., and Irving, A.J., (1989) Geology of the Highwood Mountains, Montana: a survey of magma types and sources, in Hearn, B.C., Jr., Dudas, F.O., Eggler, D.H., Hyndman, D.W., O'Brien, H.E., McCallum, I.S., Irving, A.J., and Berg, R.B., Montana High-Potassium Igneous Province : 28th International Geological Congress, Field Trip Guidebook T346: Washington, D.C., American Geophysical Union, p. 23-35.
www.minsocam.org (n.d.) http://www.minsocam.org/ammin/AM23/AM23_837.pdf
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