A Mn occurrence located in Alum Rock Park, 2.5 km (8,200 feet) NE of East Foothills and about 5 miles E of San Jose.
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.
Mineral List
Mineral list contains entries from the region specified including sub-localities
The above list contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to
visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders
for access and that you are aware of all safety precautions necessary.
References
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.
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.
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.
External Links
www.mineralsocal.org
This page is currently not sponsored. To sponsor this page click here.
Mineral and Locality Search
