Black Stone deposit (Black Stone Manganese deposit), Afton, San Bernardino County, California, USAi
| Regional Level Types | |
|---|---|
| Black Stone deposit (Black Stone Manganese deposit) | Deposit |
| Afton | Community (Former) |
| San Bernardino County | County |
| California | State |
| USA | Country |
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Latitude & Longitude (WGS84):
35° 0' 43'' North , 116° 20' 59'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Baker | 735 (2011) | 37.6km |
| Fort Irwin | 8,845 (2011) | 41.2km |
A Mn occurrence located in sec. 28, T11N, R6E, SBM, 3.8 km (2.3 miles) SE of Afton, S of Afton Canyon and the Mojave River. MRDS database stated accuracy for this location is 1,000 meters.
NOTE: USGS MRDS database file #10033533 presents MRDS file #10286477 as a related file; however, it has no relationship whatever and pertains to another locality.
Mineralization is hosted in limestone and granite. The ore body strikes N and dips 70E at a thickness of 1.22 meters, a width of 3.05 meters and a length of 15.24 meters. A series of Mn lenses occur on the contact between granite and limestone for a distance of 1,000 feet. The contact strikes N-S and dips 70E. The largest lens is 50 feet long and 8 to 10 feet wide. The fracture can be traced for 1 mile and at intervals shows from 8 inches (20 cm) to 4 feet of ore. The ore is mostly psilomelane with some pyrolusite. Local rocks include Miocene nonmarine rocks.
Select Mineral List Type
Standard Detailed Gallery Strunz Chemical ElementsCommodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.Mineral List
1 valid mineral.
Rock Types Recorded
Note: data is currently VERY limited. Please bear with us while we work towards adding this information!
Select Rock List Type
Alphabetical List Tree DiagramDetailed Mineral List:
| ⓘ 'Psilomelane' |
| ⓘ Pyrolusite Formula: Mn4+O2 |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Pyrolusite | 4.DB.05 | Mn4+O2 |
| Unclassified | |||
| ⓘ | 'Psilomelane' | - | |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Pyrolusite | Mn4+O2 |
| Mn | Manganese | |
| Mn | ⓘ Pyrolusite | Mn4+O2 |
Other Databases
| Link to USGS MRDS: | 10033533 |
|---|---|
| Link to USGS MRDS: | 10159907 |
Other Regions, Features and Areas containing this locality
North AmericaContinent
North America PlateTectonic Plate
- Basin and Range BasinsBasin
- Mojave DomainDomain
- Southern Basin and RangeWide Rift
USA
- California
- San Bernardino County
- Cady MountainsMountain Range
- San Bernardino County
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