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Rootbeer Pegmatite, Delmoe Lake area, Boulder Batholith, Jefferson Co., Montana, USA

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Latitude & Longitude (WGS84): 45° 59' 37'' North , 112° 21' 9'' West
Latitude & Longitude (decimal): 45.99386,-112.35254
GeoHash:G#: c80jekgms
Locality type:Diggings (Active) - last checked 2018
Köppen climate type:BSk : Cold semi-arid (steppe) climate


The Rootbeer Pegmatite is an advanced, well formed pegmatite that lies in the Delmoe Lake area of the Boulder Batholith, Silver Bow County, Montana. The pegmatite is comprised of large aplite/graphic granite outcrops at the base of a hill. The list of minerals found at this locale, is extensive, and includes, but is not limited to: Quartz var. Morion (Smokey Quartz), Feldspars, Schorl, Rutile, Muscovite, Mica, Topaz, Cleavelandite, Molybdenite, Pyrite, Amazonite, Quartz var. Amethyst. This locality is presently being actively worked.

Regions containing this locality

Rocky Mountains, North America

Mountain Range - 2,039 mineral species & varietal names listed

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


2 valid minerals.

Detailed Mineral List:

Quartz
Formula: SiO2
Habit: Hexagonal
Colour: Black
Description: Morion (Smokey) Quartz, deep black hexagonal crystals
Reference: Ryan Sweeney Collection
Topaz
Formula: Al2(SiO4)(F,OH)2
Habit: Orthorhombic
Colour: Gold, Yellow, Clear
Description: Light Golden colored, Well formed Topaz Crystal
Reference: Ryan Sweeney Collection

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
'Quartz'4.DA.05SiO2
Group 9 - Silicates
'Topaz'9.AF.35Al2(SiO4)(F,OH)2

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] coordination only
Topaz52.3.1.1Al2(SiO4)(F,OH)2
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2

List of minerals for each chemical element

HHydrogen
H TopazAl2(SiO4)(F,OH)2
OOxygen
O QuartzSiO2
O TopazAl2(SiO4)(F,OH)2
FFluorine
F TopazAl2(SiO4)(F,OH)2
AlAluminium
Al TopazAl2(SiO4)(F,OH)2
SiSilicon
Si QuartzSiO2
Si TopazAl2(SiO4)(F,OH)2

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Cretaceous
66 - 145 Ma



ID: 2114069
Monzogranite in the Anaconda Range and the Boulder batholith

Age: Cretaceous (66 - 145 Ma)

Lithology: Major:: {monzogranite}

Reference: Zientek, M.L., P.D. Derkey, R.J. Miller, J.D. Causet et al. Spatial Databases for the Geology of the Northern Rocky Mountains - Idaho, Montana, and Washington. U.S. Geological Survey Open-File Report 2005-1235 Version 1.0. [25]

Cretaceous
66 - 145 Ma



ID: 3187684
Mesozoic intrusive rocks

Age: Cretaceous (66 - 145 Ma)

Lithology: Intrusive igneous rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Cretaceous
66 - 145 Ma



ID: 2984479
Granitic rock

Age: Cretaceous (66 - 145 Ma)

Comments: Original map source: Vuke, S.M., Porter, K.W., Lonn, J.D., and Lopez, D.A., 2007, Geologic Map of Montana - Compact Disc: Montana Bureau of Mines and Geology: Geologic Map 62-C, 73 p., 2 sheets, scale 1:500,000. This map was digitized in 2012 as a result of a contract betwe

Lithology: Major:{granitic}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License


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