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Dumortierite Pegmatite Locality (MRDS - 10019821), Madison County, Montana, USAi
| Regional Level Types | |
|---|---|
| Dumortierite Pegmatite Locality (MRDS - 10019821) | - not defined - |
| Madison County | County |
| Montana | State |
| USA | Country |
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Latitude & Longitude (WGS84):
45° 15' 32'' North , 112° 19' 50'' West
Latitude & Longitude (decimal):
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Alder | 103 (2011) | 18.9km |
| Sheridan | 677 (2017) | 24.2km |
| Dillon | 4,210 (2017) | 24.5km |
| Virginia City | 199 (2017) | 30.3km |
| Twin Bridges | 394 (2017) | 31.7km |
A granite pegmatite exposure extending over 650 meters long and up to 20 meters wide. It is noteworthy that Graham and Robsertson (1951) found several additional boron silicates that they could not identify. Two colors (blue and green) of dumortierite were "identified", but the rare minerals seemed to be associated with the blue dumortierite preferentially. The USBM co-ordinates may be in error as they seem to put the pegmatite on the wrong fork of the souther tributary. The locality does straddle a southern tributary of Spring Creek and is located across the boundary of Sections 3 and 4 of Township 7 South, Range 6 West. The co-ordinates were chosen fropm an estimate of the position shown in Graham and Robertson (1951) and the Christiansen Ranch Quadrangle map of Spring Creek.
Deposit:: CONSV. DIV. COMP. DATE, 05-27-1963
Commodities (Major) - Aluminum
Development Status: Occurrence
Host Rock Unit: Pre Belt
Host Rock: Gneiss, Schist
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsMineral List
6 valid minerals.
Rock Types Recorded
Select Rock List Type
Alphabetical List Tree DiagramDetailed Mineral List:
| ⓘ Albite Formula: Na(AlSi3O8) References: |
| ⓘ Albite var. Oligoclase Formula: (Na,Ca)[Al(Si,Al)Si2O8] References: |
| ⓘ Dumortierite Formula: Al(Al2O)(Al2O)2(SiO4)3(BO3) |
| ⓘ 'Feldspar Group' References: |
| ⓘ 'Feldspar Group var. Perthite' References: |
| ⓘ Microcline Formula: K(AlSi3O8) References: |
| ⓘ Muscovite Formula: KAl2(AlSi3O10)(OH)2 References: |
| ⓘ Quartz Formula: SiO2 References: |
| ⓘ Schorl Formula: NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH) References: |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| Group 9 - Silicates | |||
| ⓘ | Dumortierite | 9.AJ.10 | Al(Al2O)(Al2O)2(SiO4)3(BO3) |
| ⓘ | Schorl | 9.CK.05 | NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH) |
| ⓘ | Muscovite | 9.EC.15 | KAl2(AlSi3O10)(OH)2 |
| ⓘ | Microcline | 9.FA.30 | K(AlSi3O8) |
| ⓘ | Albite | 9.FA.35 | Na(AlSi3O8) |
| ⓘ | var. Oligoclase | 9.FA.35 | (Na,Ca)[Al(Si,Al)Si2O8] |
| Unclassified | |||
| ⓘ | 'Feldspar Group' | - | |
| ⓘ | 'var. Perthite' | - | |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| H | ⓘ Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| B | Boron | |
| B | ⓘ Dumortierite | Al(Al2O)(Al2O)2(SiO4)3(BO3) |
| B | ⓘ Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| O | Oxygen | |
| O | ⓘ Albite | Na(AlSi3O8) |
| O | ⓘ Dumortierite | Al(Al2O)(Al2O)2(SiO4)3(BO3) |
| O | ⓘ Microcline | K(AlSi3O8) |
| O | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| O | ⓘ Albite var. Oligoclase | (Na,Ca)[Al(Si,Al)Si2O8] |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| Na | Sodium | |
| Na | ⓘ Albite | Na(AlSi3O8) |
| Na | ⓘ Albite var. Oligoclase | (Na,Ca)[Al(Si,Al)Si2O8] |
| Na | ⓘ Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| Al | Aluminium | |
| Al | ⓘ Albite | Na(AlSi3O8) |
| Al | ⓘ Dumortierite | Al(Al2O)(Al2O)2(SiO4)3(BO3) |
| Al | ⓘ Microcline | K(AlSi3O8) |
| Al | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Al | ⓘ Albite var. Oligoclase | (Na,Ca)[Al(Si,Al)Si2O8] |
| Al | ⓘ Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| Si | Silicon | |
| Si | ⓘ Albite | Na(AlSi3O8) |
| Si | ⓘ Dumortierite | Al(Al2O)(Al2O)2(SiO4)3(BO3) |
| Si | ⓘ Microcline | K(AlSi3O8) |
| Si | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Si | ⓘ Albite var. Oligoclase | (Na,Ca)[Al(Si,Al)Si2O8] |
| Si | ⓘ Quartz | SiO2 |
| Si | ⓘ Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
| K | Potassium | |
| K | ⓘ Microcline | K(AlSi3O8) |
| K | ⓘ Muscovite | KAl2(AlSi3O10)(OH)2 |
| Ca | Calcium | |
| Ca | ⓘ Albite var. Oligoclase | (Na,Ca)[Al(Si,Al)Si2O8] |
| Fe | Iron | |
| Fe | ⓘ Schorl | NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH) |
Other Databases
| Link to USGS MRDS: | 10019821 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
- Rocky MountainsMountain Range
North America PlateTectonic Plate
- Northern Rocky MountainsWide Rift
- Wyoming DomainDomain
USA
- Montana
- Ruby RangeMountain Range
- Western Phosphate fieldMineral Province
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