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Railroad Cut, Delmoe Lake Road occurrences, Pipestone District, Jefferson Co., Montana, USA

This page kindly sponsored by Richard Gibson
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Latitude & Longitude (WGS84): 45° 55' 24'' North , 112° 15' 57'' West
Latitude & Longitude (decimal): 45.92350,-112.26585
GeoHash:G#: c80jm24eb
Other regions containing this locality:Rocky Mountains, North America
Köppen climate type:BSk : Cold semi-arid (steppe) climate


Altered rocks along or near the contact between the Butte Pluton of the Boulder Batholith and older (Cretaceous) Elkhorn Mountains Volcanic rocks. Includes small pegmatites nearby. The mineral assemblage at Spire Rock Flats, https://www.mindat.org/loc-210985.html, is similar to that at this location.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


5 valid minerals.

Detailed Mineral List:

'Apatite'
Reference: Gibson, R.I., 2017, Geology and mineralogy of the eastern margin of the Butte Pluton, Montana: Proceedings, Montana Mining and Mineral Symposium 2017, Montana Bureau of Mines and Geology, in press.
'Axinite Group'
Reference: Gibson, R.I., 2017, Geology and mineralogy of the eastern margin of the Butte Pluton, Montana: Proceedings, Montana Mining and Mineral Symposium 2017, Montana Bureau of Mines and Geology, in press.
Clinochlore
Formula: Mg5Al(AlSi3O10)(OH)8
Reference: Gibson, R.I., 2017, Geology and mineralogy of the eastern margin of the Butte Pluton, Montana: Proceedings, Montana Mining and Mineral Symposium 2017, Montana Bureau of Mines and Geology, in press.
Epidote
Formula: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Reference: Gibson, R.I., 2017, Geology and mineralogy of the eastern margin of the Butte Pluton, Montana: Proceedings, Montana Mining and Mineral Symposium 2017, Montana Bureau of Mines and Geology, in press.
Microcline
Formula: K(AlSi3O8)
Reference: Gibson, R.I., 2017, Geology and mineralogy of the eastern margin of the Butte Pluton, Montana: Proceedings, Montana Mining and Mineral Symposium 2017, Montana Bureau of Mines and Geology, in press.
Schorl
Formula: Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Reference: Gibson, R.I., 2017, Geology and mineralogy of the eastern margin of the Butte Pluton, Montana: Proceedings, Montana Mining and Mineral Symposium 2017, Montana Bureau of Mines and Geology, in press.
Titanite
Formula: CaTi(SiO4)O
Reference: Gibson, R.I., 2017, Geology and mineralogy of the eastern margin of the Butte Pluton, Montana: Proceedings, Montana Mining and Mineral Symposium 2017, Montana Bureau of Mines and Geology, in press.

List of minerals arranged by Strunz 10th Edition classification

Group 9 - Silicates
'Clinochlore'9.EC.55Mg5Al(AlSi3O10)(OH)8
'Epidote'9.BG.05a{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
'Microcline'9.FA.30K(AlSi3O8)
'Schorl'9.CK.05Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
'Titanite'9.AG.15CaTi(SiO4)O
Unclassified Minerals, Rocks, etc.
'Apatite'-
'Axinite Group'-

List of minerals arranged by Dana 8th Edition classification

Group 52 - NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] and/or >[6] coordination
Titanite52.4.3.1CaTi(SiO4)O
Group 58 - SOROSILICATES Insular, Mixed, Single, and Larger Tetrahedral Groups
Insular, Mixed, Single, and Larger Tetrahedral Groups with cations in [6] and higher coordination; single and double groups (n = 1, 2)
Epidote58.2.1a.7{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Group 61 - CYCLOSILICATES Six-Membered Rings
Six-Membered Rings with borate groups
Schorl61.3.1.10Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings interlayered 1:1, 2:1, and octahedra
Clinochlore71.4.1.4Mg5Al(AlSi3O10)(OH)8
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Microcline76.1.1.5K(AlSi3O8)
Unclassified Minerals, Rocks, etc.
'Apatite'-
'Axinite Group'-

List of minerals for each chemical element

HHydrogen
H ClinochloreMg5Al(AlSi3O10)(OH)8
H Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
H SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
BBoron
B SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
OOxygen
O ClinochloreMg5Al(AlSi3O10)(OH)8
O Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
O MicroclineK(AlSi3O8)
O SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
O TitaniteCaTi(SiO4)O
NaSodium
Na SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
MgMagnesium
Mg ClinochloreMg5Al(AlSi3O10)(OH)8
AlAluminium
Al ClinochloreMg5Al(AlSi3O10)(OH)8
Al Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Al MicroclineK(AlSi3O8)
Al SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
SiSilicon
Si ClinochloreMg5Al(AlSi3O10)(OH)8
Si Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Si MicroclineK(AlSi3O8)
Si SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
Si TitaniteCaTi(SiO4)O
KPotassium
K MicroclineK(AlSi3O8)
CaCalcium
Ca Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Ca TitaniteCaTi(SiO4)O
TiTitanium
Ti TitaniteCaTi(SiO4)O
FeIron
Fe Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Fe SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)

References

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Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Gibson, R.I., 2017, Geology and mineralogy of the eastern margin of the Butte Pluton, Montana: Proceedings, Montana Mining and Mineral Symposium 2017, Montana Bureau of Mines and Geology, in press.


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