Vote for your favorite mineral in #MinCup26! - Sphalerite vs. Anorthite
Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
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Antigorite from
Pacific Cement and Aggregate Company quarry, Santa Cruz, Santa Cruz County, California, USA


Locality type:Quarry
Classification
Species:Antigorite
Formula:Mg3(Si2O5)(OH)4
Comments:Occurs as an alteration product of forsterite.
Confirmation
Validity:Believed Valid
Associated Minerals:
Associates:Forsterite
Data
Mineral Data:Click here to view Antigorite data
Locality Data:Click here to view Pacific Cement and Aggregate Company quarry, Santa Cruz, Santa Cruz County, California, USA
Data Identifiers
Mindat Occurrence Record ID:138102
Long-form Identifier:1:3:138102:3
GUID (UUID V4):0
Nearest other occurrences of Antigorite
72.2km (44.9 miles) ⓘBlack Bart Mine group, Red Mountain, Black Wonder Mining District, Stanislaus County, California, USA
74.7km (46.4 miles) ⓘMendenhall No. 1 Mine (Cedar Mountain Mine; Mendenhall Chrome Mines; Mendenhall Mine; Newman Mine), Cedar Mountain, Cedar Mountain Mining District, Alameda County, California, USA
93.4km (58.0 miles) ⓘDel Puerto Canyon (Arroyo del Puerto), Copper Mountain, Black Wonder Mining District, Stanislaus County, California, USA
99.5km (61.8 miles) ⓘFort Point, San Francisco, San Francisco County, California, USA
References
Gross, E.B., Wainwright, J.E.N., and Evans, B.W. (1965) Pabstite, the tin analogue of benitoite. American Mineralogist: 50: 1164-1169
Gross, Eugene B., Chesterman, Charles W., Dunning, Gail, Cooper, Joseph F. (1967) Mineralogy of the Kalkar quarry, Santa Cruz, California, in Short Contributions to California Geology. Special Report 92, California Division of Mines & Geology. 3-10
Pemberton, H. Earl (1983) Minerals of California. Van Nostrand Reinhold Company Inc.
Cooper, Joseph F., Dunning, Gail E. (1986) Mineralogy of the Kalkar Quarry, Santa Cruz, California. The Mineralogical Record, 17 (5) 315-326
 
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