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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Quartz from
West of San Onofre Mountain, San Onofre Mountain, Marine Corps Base Camp Pendleton, San Diego County, California, USA


Locality type:Mountain
Classification
Species:Quartz
Formula:SiO2
Confirmation
Validity:Believed Valid
Associated Minerals:
Associates:Aegirine
Crossite
Data
Mineral Data:Click here to view Quartz data
Locality Data:Click here to view West of San Onofre Mountain, San Onofre Mountain, Marine Corps Base Camp Pendleton, San Diego County, California, USA
Data Identifiers
Mindat Occurrence Record ID:677369
Long-form Identifier:1:3:677369:4
GUID (UUID V4):0
Nearest other occurrences of Quartz
16.7km (10.4 miles) ⓘSanta Margarita Ranch (Rancho Santa Margarita), San Diego County, California, USA
17.4km (10.8 miles) ⓘSilver Shine prospect, De Luz, San Diego County, California, USA
22.1km (13.7 miles) ⓘKuhnis Mine, De Luz, San Diego County, California, USA
23.0km (14.3 miles) ⓘFallbrook Street, Fallbrook, San Diego County, California, USA
31.0km (19.3 miles) ⓘFreeman Mine, Moosa Canyon, Bonsall, San Diego County, California, USA
31.0km (19.3 miles) ⓘMoosa Canyon, Bonsall, San Diego County, California, USA
31.5km (19.6 miles) ⓘVista Chief Mine (Freeman deposit; Freeman mine; Moosa Canyon deposit), Moosa Canyon, Bonsall, San Diego County, California, USA
33.5km (20.8 miles) ⓘEpsomite occurrences, Laguna Beach, Orange County, California, USA
33.5km (20.8 miles) ⓘOrtega Mine (Old Dominion Mine), Rancho Santa Margarita, Orange County, California, USA
33.9km (21.1 miles) ⓘMurrieta, Riverside County, California, USA
References
its nature and origin: University of California, Department of Geological Sciences Bulletin 15: 159-280
Woodford, A.O. (1925), The San Onofre breccia
[… (abstract): Geol. Zentralbl., Band 33: 109 (1926)]: 186
Pemberton, H. Earl (1983) Minerals of California. Van Nostrand Reinhold Company Inc.
 
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