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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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Cristobalite from
Reyes Adobe Road and Route 101 intersection area, Agoura Hills, Los Angeles County, California, USA


08706870017360509336929.jpg
Cristobalite, etc.

Reyes Adobe Road and Route 101 intersection area, Agoura Hills, Los Angeles County, California, USA
02658170017360509365267.jpg
Cristobalite, etc.

Reyes Adobe Road and Route 101 intersection area, Agoura Hills, Los Angeles County, California, USA
05933180017272329731023.jpg
Cristobalite, etc.

Reyes Adobe Road and Route 101 intersection area, Agoura Hills, Los Angeles County, California, USA
02658170017360509365267.jpg
Cristobalite, etc.

Reyes Adobe Road and Route 101 intersection area, Agoura Hills, Los Angeles County, California, USA
05933180017272329731023.jpg
Cristobalite, etc.

Reyes Adobe Road and Route 101 intersection area, Agoura Hills, Los Angeles County, California, USA
02658170017360509365267.jpg
Cristobalite, etc.

Reyes Adobe Road and Route 101 intersection area, Agoura Hills, Los Angeles County, California, USA
Locality type:Occurrence
Classification
Species:Cristobalite
Formula:SiO2
Confirmation
Validity:Confirmed
Confirmation Methods:SEM-EDS
Associated Minerals Based on Photo Data:
Mordenite2
Clinoptilolite Subgroup1
Data
Mineral Data:Click here to view Cristobalite data
Locality Data:Click here to view Reyes Adobe Road and Route 101 intersection area, Agoura Hills, Los Angeles County, California, USA
Photo GalleryView Gallery (2 photos)
Data Identifiers
Mindat Occurrence Record ID:906705
Long-form Identifier:1:3:906705:9
GUID (UUID V4):0
Nearest other occurrences of Cristobalite
1.4km (0.9 miles) ⓘLadyface 2, Agoura Hills, Los Angeles County, California, USA
2.6km (1.6 miles) ⓘKanan Road roadcut No. 3, Agoura Hills, Los Angeles County, California, USA
3.7km (2.3 miles) ⓘLobo Canyon, Agoura Hills, Los Angeles County, California, USA
48.0km (29.8 miles) ⓘTick Canyon, Lang, Los Angeles County, California, USA
References
Rader, W.L. (1998), Zeolite-group minerals of the Conejo Volcanics, Santa Monica Mountains, Los Angeles and Ventura Counties. Mineral News: 14(9): 1-10.
 
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