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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Opal-AN from
Bulldozer Hill, Tiptop Mine group (Tiptop Camp prospects/mines), Tiptop Mountain, Helvetia, Helvetia-Rosemont Mining District, Pima County, Arizona, USA


08380800017272022265427.jpg
Opal-AN

Bulldozer Hill, Tiptop Mine group, Tiptop Mountain, Helvetia, Helvetia-Rosemont Mining District, Pima County, Arizona, USA
08380800017272022265427.jpg
Opal-AN

Bulldozer Hill, Tiptop Mine group, Tiptop Mountain, Helvetia, Helvetia-Rosemont Mining District, Pima County, Arizona, USA
08380800017272022265427.jpg
Opal-AN

Bulldozer Hill, Tiptop Mine group, Tiptop Mountain, Helvetia, Helvetia-Rosemont Mining District, Pima County, Arizona, USA
Locality type:Hill
Classification
Species:Opal var: Opal-AN
Formula:SiO2 · nH2O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Opal-AN data
Locality Data:Click here to view Bulldozer Hill, Tiptop Mine group (Tiptop Camp prospects/mines), Tiptop Mountain, Helvetia, Helvetia-Rosemont Mining District, Pima County, Arizona, USA
Data Identifiers
Mindat Occurrence Record ID:528197
Long-form Identifier:1:3:528197:8
GUID (UUID V4):0
Nearest other occurrences of Opal-AN
27.5km (17.1 miles) ⓘMission complex, San Xavier, Pima Mining District, Sierrita Mountains, Pima County, Arizona, USA
57.8km (35.9 miles) ⓘOld Yuma Mine, Tucson Mountain District Saguaro National Park, Amole Mining District, Tucson Mountains, Pima County, Arizona, USA
65.8km (40.9 miles) ⓘTungsten King Mine, Black Rock group, Cochise Mining District, Cochise County, Arizona, USA
69.3km (43.0 miles) ⓘReef Mine, Carr Canyon, Cochise County, Arizona, USA
72.1km (44.8 miles) ⓘEmpire Mine, Tombstone, Tombstone Mining District, Cochise County, Arizona, USA
72.2km (44.8 miles) ⓘGrand Central Mine, Contention-Grand Central Mine group, Tombstone Mining District, Cochise County, Arizona, USA
73.6km (45.7 miles) ⓘCenturion Mine, Centurion, Cochise Mining District, Cochise County, Arizona, USA
References
P Cristofono collection, 2008
 
and/or  
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