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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Chalcopyrite from
Friday Mine, Julian, Julian Mining District, San Diego County, California, USA


Locality type:Mine
Classification
Species:Chalcopyrite
Formula:CuFeS2
Comments:Occurs in massive pyrrhotite.
Confirmation
Validity:Believed Valid
Associated Minerals:
Associates:Pyrrhotite
Data
Mineral Data:Click here to view Chalcopyrite data
Locality Data:Click here to view Friday Mine, Julian, Julian Mining District, San Diego County, California, USA
Data Identifiers
Mindat Occurrence Record ID:65613
Long-form Identifier:1:3:65613:7
GUID (UUID V4):0
Nearest other occurrences of Chalcopyrite
14.3km (8.9 miles) ⓘGrapevine Star Mine (Dewey group; Ready Relief), Grapevine Canyon, Ranchita, Volcan Mountains, San Diego County, California, USA
21.3km (13.2 miles) ⓘDaley Mine (Barona Mine; Barona claims), Ramona, Ramona Mining District, San Diego County, California, USA
22.8km (14.2 miles) ⓘOld Ironsides prospect, Mesa Grande, Mesa Grande Mining District, San Diego County, California, USA
28.7km (17.9 miles) ⓘEl Capitan Quarry, Lakeside, San Diego County, California, USA
54.9km (34.1 miles) ⓘCedar Creek Mine (Cedar Creek Lost Spanish Mine; Lost Spanish Mine), Dulzura, San Ysidro Mountains, San Diego County, California, USA
56.4km (35.0 miles) ⓘEncinitas Mine (Danes Lea Mine), Rancho Santa Fe, San Diego County, California, USA
85.0km (52.8 miles) ⓘEl Espíritu mine, La Rumorosa, Tecate Municipality, Baja California, Mexico
86.5km (53.7 miles) ⓘElectric Copper and Gold Mine, Wildomar, Riverside County, California, USA
87.4km (54.3 miles) ⓘTresoro prospect, La Rumorosa, Tecate Municipality, Baja California, Mexico
92.6km (57.5 miles) ⓘSilver Shine prospect, De Luz, San Diego County, California, USA
References
Dana 7: I: 264.
Calkins, F.C. (1916), An occurrence of nickel ore in San Diego County, California: USGS Bulletin 640: 79
Hudson, Frank Samuel (1922), Geology of the Cuyamaca region of California with special reference to the origin of the Nickeliferous pyrrhotite: University of California, Department of Geological Sciences Bulletin: 13: 217, 219
Short, M. N., Shannon, Earl V. (1930) Violarite and other rare nickel sulphides. American Mineralogist, 15 (1) 1-22 p.8
Donnelly, Maurice (1934) Geology and mineral deposits of the Julian District, San Diego County, California. California Journal of Mines and Geology, 30 (4) 331-370
 
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