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
Hillsdale Mine (Chaboya-Hillsdale Mine; San Juan Bautista Mine; San Juan Mine; San Juan Quicksilver Mine; Sheboya Mine; Chapman Mine; Oak Hill Mine), Oak Hill, San Jose, Santa Clara County, California, USA


Locality type:Mine
Classification
Species:Quartz
Formula:SiO2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Quartz data
Locality Data:Click here to view Hillsdale Mine (Chaboya-Hillsdale Mine; San Juan Bautista Mine; San Juan Mine; San Juan Quicksilver Mine; Sheboya Mine; Chapman Mine; Oak Hill Mine), Oak Hill, San Jose, Santa Clara County, California, USA
Data Identifiers
Mindat Occurrence Record ID:980771
Long-form Identifier:1:3:980771:6
GUID (UUID V4):0
Nearest other occurrences of Quartz
6.9km (4.3 miles) ⓘLone Hill Quarry (Mirasson Brothers Quarry), Lone Hill, San Jose, Santa Clara County, California, USA
8.6km (5.3 miles) ⓘSanta Teresa Mine, New Almaden, New Almaden Mining District, Santa Clara County, California, USA
9.5km (5.9 miles) ⓘGuadalupe Mine, New Almaden, New Almaden Mining District, Santa Clara County, California, USA
9.6km (6.0 miles) ⓘBernal Mine, New Almaden, New Almaden Mining District, Santa Clara County, California, USA
12.0km (7.5 miles) ⓘAmerican Mine, New Almaden, New Almaden Mining District, Santa Clara County, California, USA
12.6km (7.8 miles) ⓘSan Pedro-Almaden Area Mine (New Almaden - San Pedro-Almaden Area), New Almaden, New Almaden Mining District, Santa Clara County, California, USA
12.6km (7.8 miles) ⓘMine Hill, New Almaden, New Almaden Mining District, Santa Clara County, California, USA
12.6km (7.8 miles) ⓘNew Almaden Mine (New Almaden Mines), New Almaden, New Almaden Mining District, Santa Clara County, California, USA
12.8km (8.0 miles) ⓘSanta Mariana Area Mine, New Almaden, New Almaden Mining District, Santa Clara County, California, USA
12.9km (8.0 miles) ⓘCora Blanca Area Mine (New Almaden - Cora Blanca area), New Almaden, New Almaden Mining District, Santa Clara County, California, USA
References
Hutton, C. Osborne (1956) Further data on the stilpnomelane mineral group. American Mineralogist, 41 (7-8) 608-615
 
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