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San Jose Mine, East Foothills, Black Wonder Mining District, Santa Clara Co., California, USAi
Regional Level Types
San Jose MineMine
East Foothills- not defined -
Black Wonder Mining DistrictMining District
Santa Clara Co.County
CaliforniaState
USACountry

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Key
Latitude & Longitude (WGS84):
37° 23' 52'' North , 121° 47' 54'' West
Latitude & Longitude (decimal):
Locality type:
Nearest Settlements:
PlacePopulationDistance
East Foothills8,269 (2011)2.5km
Alum Rock15,536 (2018)4.3km
Milpitas77,604 (2017)10.1km
San Jose1,026,908 (2017)10.7km
Seven Trees1,788 (2018)12.9km


A former Mn occurrence/mine located in the N½SW¼NW¼ sec. 34, T6S, R1E, MDM, 2.7 km (1.7 miles; 8,900 feet) NE of East Foothills (town), in Alum Rock Park, along Penitencia Creek. MRDS database stated accuracy for this location is 500 meters.

A single boulder in Alum Rock Park was first thought by some to be a "meteor" (meteorite), but was later found to consist of primarily manganese minerals. In 1918 it was sold by the city to be mined for its manganese content and is now gone, with only small fragments remaining in Penitencia Creek.

A white powdery coating on rocks near the mineral springs in the park was thought to be alum by a local farmer, giving the park its name. The true identity of this mineral is thenardite.

Local rocks include Cretaceous marine rocks (in part nonmarine), unit 1 (Coast Ranges).

Workings include surface openings.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


9 valid minerals. 1 (TL) - type locality of valid minerals.

Detailed Mineral List:

Alabandite
Formula: MnS
Reference: Rogers, Austin Flint (1924b), Kempite, a new manganese mineral from Santa Clara County, California: American Journal of Science, 5th. Series: 8: 145-150; […(abstract): Geological Society of America Bulletin: 36: 206 (1925)]: 206; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 59; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 106; www.mineralsocal.org
Alleghanyite
Formula: Mn2+5(SiO4)2(OH)2
Reference: Rogers, Austin Flint (1919b), An interesting occurrence of manganese minerals near San Jose, California: American Journal of Science, 4th. Series: 48: 443; Ross, Clarence Samuel & Paul F. Kerr (1932), Manganese mineral of a vein near Bald Knob, North Carolina: American Mineralogist: 17: 13; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 61; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 413; www.mineralsocal.org
Baryte
Formula: BaSO4
Description: Occurred as crystals of unusual habit in seams in the Mn-boulder.
Reference: Rogers, Austin Flint (1919b), An interesting occurrence of manganese minerals near San Jose, California: American Journal of Science, 4th. Series: 48: 447; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 99, 192; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 294; www.mineralsocal.org; U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Ganophyllite
Formula: (K,Na,Ca)2Mn8(Si,Al)12(O,OH)32 · 8H2O
Colour: Brownish yellow
Description: Occurs as tabular crystals in seams with baryte.
Reference: Rogers, Austin Flint (1919b), An interesting occurrence of manganese minerals near San Jose, California: American Journal of Science, 4th. Series: 48: 446; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 192; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 410.; USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10077482.
Hausmannite
Formula: Mn2+Mn3+2O4
Description: Abundant as crystals and subhedral grains.
Reference: Rogers, Austin Flint (1919b), An interesting occurrence of manganese minerals near San Jose, California: American Journal of Science, 4th. Series: 48: 444; Rogers, Austin Flint (1924b), Kempite, a new manganese mineral from Santa Clara County, California: American Journal of Science, 5th. Series: 8: 145-150; […(abstract): Geological Society of America Bulletin: 36: 206 (1925)]: 206; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 59, 215, 235; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 167; www.mineralsocal.org; U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Kempite (TL)
Formula: Mn2+2(OH)3Cl
Type Locality:
Colour: Green
Description: Minute crystals.
Reference: Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 74; Rogers, Austin Flint (1924b), Kempite, a new manganese mineral from Santa Clara County, California: American Journal of Science, 5th. Series: 8: 145-150; […(abstract): Geological Society of America Bulletin: 36: 206 (1925)]: 145; Rogers, Austin Flint (1924b), Kempite, a new manganese mineral from Santa Clara County, California: American Journal of Science, 5th. Series: 8: 145-150; […(abstract): Geological Society of America Bulletin: 36: 206 (1925)]: 145; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 235; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 190.
'Psilomelane'
Formula: Mn, O
Description: Formed the dark outer rim of the boulder.
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.; Rogers, Austin Flint (1919b), An interesting occurrence of manganese minerals near San Jose, California: American Journal of Science, 4th. Series: 48: 447; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 299.
Pyrochroite
Formula: Mn(OH)2
Reference: Rogers, Austin Flint (1919b), An interesting occurrence of manganese minerals near San Jose, California: American Journal of Science, 4th. Series: 48: 445; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 235, 302; www.mineralsocal.org; USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10077482.
Rhodochrosite
Formula: MnCO3
Description: Crystals with unusual, unspecified, crystal faces.
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.; Rogers, Austin Flint (1919b), An interesting occurrence of manganese minerals near San Jose, California: American Journal of Science, 4th. Series: 48: 446; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 320.
Tephroite ?
Formula: Mn2+2SiO4
Habit: massive
Colour: Grayish red
Description: Tephroite reported by Rogers is most likely alleghanyite, as per the comments in the type locality description of alleghanyite published in "Ross, Clarence Samuel & Paul F. Kerr (1932), Manganese mineral of a vein near Bald Knob, North Carolina: American Mineralogist: 17: 1-18". A new analysis is needed to confirm.
Reference: Rogers, Austin Flint (1919b), An interesting occurrence of manganese minerals near San Jose, California: American Journal of Science, 4th. Series: 48: 444; Rogers, Austin Flint (1924b), Kempite, a new manganese mineral from Santa Clara County, California: American Journal of Science, 5th. Series: 8: 145-150; […(abstract): Geological Society of America Bulletin: 36: 206 (1925)]: 206; Ross, Clarence Samuel & Paul F. Kerr (1932), Manganese mineral of a vein near Bald Knob, North Carolina: American Mineralogist: 17: 13; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 59, 362; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 460; www.mineralsocal.org; U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Alabandite2.CD.10MnS
Group 3 - Halides
Kempite (TL)3.DA.10aMn2+2(OH)3Cl
Group 4 - Oxides and Hydroxides
Hausmannite4.BB.10Mn2+Mn3+2O4
Pyrochroite4.FE.05Mn(OH)2
Group 5 - Nitrates and Carbonates
Rhodochrosite5.AB.05MnCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Baryte7.AD.35BaSO4
Group 9 - Silicates
Alleghanyite9.AF.45Mn2+5(SiO4)2(OH)2
Ganophyllite9.EG.30(K,Na,Ca)2Mn8(Si,Al)12(O,OH)32 · 8H2O
Tephroite ?9.AC.05Mn2+2SiO4
Unclassified Minerals, Rocks, etc.
'Psilomelane'-Mn, O

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmXp, with m:p = 1:1
Alabandite2.8.1.4MnS
Group 6 - HYDROXIDES AND OXIDES CONTAINING HYDROXYL
X(OH)2
Pyrochroite6.2.1.3Mn(OH)2
Group 7 - MULTIPLE OXIDES
AB2X4
Hausmannite7.2.7.1Mn2+Mn3+2O4
Group 10 - OXYHALIDES AND HYDROXYHALIDES
A2(O,OH)3Xq
Kempite (TL)10.1.4.1Mn2+2(OH)3Cl
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Rhodochrosite14.1.1.4MnCO3
Group 28 - ANHYDROUS ACID AND NORMAL SULFATES
AXO4
Baryte28.3.1.1BaSO4
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with all cations in octahedral [6] coordination
Tephroite ?51.3.1.4Mn2+2SiO4
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
Alleghanyite52.3.2b.1Mn2+5(SiO4)2(OH)2
Group 74 - PHYLLOSILICATES Modulated Layers
Modulated Layers with joined islands
Ganophyllite74.1.2.1(K,Na,Ca)2Mn8(Si,Al)12(O,OH)32 · 8H2O
Unclassified Minerals, Mixtures, etc.
'Psilomelane'-Mn, O

List of minerals for each chemical element

HHydrogen
H KempiteMn22+(OH)3Cl
H AlleghanyiteMn52+(SiO4)2(OH)2
H PyrochroiteMn(OH)2
H Ganophyllite(K,Na,Ca)2Mn8(Si,Al)12(O,OH)32 · 8H2O
CCarbon
C RhodochrositeMnCO3
OOxygen
O KempiteMn22+(OH)3Cl
O AlleghanyiteMn52+(SiO4)2(OH)2
O BaryteBaSO4
O HausmanniteMn2+Mn23+O4
O PyrochroiteMn(OH)2
O PsilomelaneMn, O
O RhodochrositeMnCO3
O Ganophyllite(K,Na,Ca)2Mn8(Si,Al)12(O,OH)32 · 8H2O
O TephroiteMn22+SiO4
NaSodium
Na Ganophyllite(K,Na,Ca)2Mn8(Si,Al)12(O,OH)32 · 8H2O
AlAluminium
Al Ganophyllite(K,Na,Ca)2Mn8(Si,Al)12(O,OH)32 · 8H2O
SiSilicon
Si AlleghanyiteMn52+(SiO4)2(OH)2
Si Ganophyllite(K,Na,Ca)2Mn8(Si,Al)12(O,OH)32 · 8H2O
Si TephroiteMn22+SiO4
SSulfur
S AlabanditeMnS
S BaryteBaSO4
ClChlorine
Cl KempiteMn22+(OH)3Cl
KPotassium
K Ganophyllite(K,Na,Ca)2Mn8(Si,Al)12(O,OH)32 · 8H2O
CaCalcium
Ca Ganophyllite(K,Na,Ca)2Mn8(Si,Al)12(O,OH)32 · 8H2O
MnManganese
Mn KempiteMn22+(OH)3Cl
Mn AlabanditeMnS
Mn AlleghanyiteMn52+(SiO4)2(OH)2
Mn HausmanniteMn2+Mn23+O4
Mn PyrochroiteMn(OH)2
Mn PsilomelaneMn, O
Mn RhodochrositeMnCO3
Mn Ganophyllite(K,Na,Ca)2Mn8(Si,Al)12(O,OH)32 · 8H2O
Mn TephroiteMn22+SiO4
BaBarium
Ba BaryteBaSO4

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Rogers, Austin Flint (1919b), An interesting occurrence of manganese minerals near San Jose, California: American Journal of Science, 4th. Series: 48: 443-449.
Rogers, Austin Flint (1924b), Kempite, a new manganese mineral from Santa Clara County, California: American Journal of Science, 5th. Series: 8: 145-150; […(abstract): Geological Society of America Bulletin: 36: 206 (1925)]: 145.
Ross, Clarence Samuel & Paul F. Kerr (1932), Manganese mineral of a vein near Bald Knob, North Carolina: American Mineralogist: 17: 1-18.
Trask, Parker Davies (1950) Geologic description of the manganese deposits of California. California Division of Mines Bulletin 152, 378 pp.: 263.
Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 74.
Davis, Fenelon Francis & C.W. Jennings (1954), Mines and mineral resources of Santa Clara County, California: California Journal of Mines and Geology (Report 50): 50(2): 415.
Hewett, D. F., Chesterman, C. W., & Troxel, B. W. (1961). Tephroite in California manganese deposits. Economic Geology, 56(1), 39-58.
Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 59, 61, 99, 192, 215, 235, 299, 302, 320, 362.
Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 106, 167, 190, 192, 294, 410, 413, 460.
USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10077482 & 10164766.
U.S. Bureau of Mines Minerals Availability System/Mineral Industry Location System (MAS/MILS): file #0060850127.

External Links

www.mineralsocal.org

Other Regions, Features and Areas containg this locality

North America
North America PlateTectonic Plate
USA

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