Alameda Company No. 39 prospect (Alameda County #39), Mendenhall Springs, Livermore Mining District (Tesla District), Alameda County, California, USAi
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Latitude & Longitude (WGS84):
37° 35' 52'' North , 121° 38' 25'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Nearest Settlements:
| Place | Population | Distance |
|---|---|---|
| Livermore | 88,126 (2017) | 14.6km |
| Pleasanton | 79,510 (2017) | 21.8km |
| Sunol | 913 (2011) | 21.9km |
| Mountain House | 9,675 (2011) | 22.3km |
| Tracy | 87,075 (2017) | 24.6km |
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
Local clubs are the best way to get access to collecting localities
| Club | Location | Distance |
|---|---|---|
| Livermore Valley Lithophiles | Livermore, California | 15km |
| Santa Clara Valley Gem & Mineral Society | San Jose, California | 36km |
| Mineral & Gem Society of Castro Valley | Hayward, California | 40km |
| East Bay Mineral and Lapidary Club | Hayward, California | 40km |
| Antioch Lapidary Club | Antioch, California | 48km |
A Mn-silica occurrence/prospect located in the center W½SW¼ sec. 10, T4S, R3E, MDM, 1.2 km (0.7 mile; 3,900 feet) NNE of Mendenhall Springs, E of Arroyo Mocho, on county owned land (located claim - fee ownership). MRDS database stated accuracy for this location is 100 meters.
The ore body is 1 meter thick with a depth-to-top of 5 meters, width of 5 meters and a length of 15 meters. The ore body is sedimentary of unknown shape. The primary mode of origin was sedimentation and the secondary mode was oxidation. Primary ore control was bedding. There is no wallrock alteration. The minimum depth-to-top is 1 meter. No outcrops of ore or rock in place or in sight here. Local rocks include rocks of the Franciscan melange.
Workings include unspecified surface openings.
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
3 valid minerals.
Detailed Mineral List:
| ⓘ 'Psilomelane' |
| ⓘ Pyrolusite Formula: Mn4+O2 |
| ⓘ Quartz Formula: SiO2 |
| ⓘ Rhodonite Formula: CaMn3Mn[Si5O15] |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 4 - Oxides and Hydroxides | |||
|---|---|---|---|
| ⓘ | Quartz | 4.DA.05 | SiO2 |
| ⓘ | Pyrolusite | 4.DB.05 | Mn4+O2 |
| Group 9 - Silicates | |||
| ⓘ | Rhodonite | 9.DK.05 | CaMn3Mn[Si5O15] |
| Unclassified | |||
| ⓘ | 'Psilomelane' | - | |
List of minerals for each chemical element
| O | Oxygen | |
|---|---|---|
| O | ⓘ Pyrolusite | Mn4+O2 |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Rhodonite | CaMn3Mn[Si5O15] |
| Si | Silicon | |
| Si | ⓘ Quartz | SiO2 |
| Si | ⓘ Rhodonite | CaMn3Mn[Si5O15] |
| Ca | Calcium | |
| Ca | ⓘ Rhodonite | CaMn3Mn[Si5O15] |
| Mn | Manganese | |
| Mn | ⓘ Pyrolusite | Mn4+O2 |
| Mn | ⓘ Rhodonite | CaMn3Mn[Si5O15] |
Other Databases
| Link to USGS MRDS: | 10187039 |
|---|
Other Regions, Features and Areas containing this locality
North AmericaContinent
- Coast MountainsMountain Range
North America PlateTectonic Plate
- California Coast RangesAccretionary Complex
- Franciscan DomainDomain
USA
- California
- Diablo RangeMountain Range
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