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 from
Unnamed Diatomite occurrence [1], Boise Mining District, Ada County, Idaho, USA


Locality type:Occurrence
Classification
Species:Opal
Formula:SiO2 · nH2O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Opal data
Locality Data:Click here to view Unnamed Diatomite occurrence [1], Boise Mining District, Ada County, Idaho, USA
Data Identifiers
Mindat Occurrence Record ID:997498
Long-form Identifier:1:3:997498:2
GUID (UUID V4):0
Nearest other occurrences of Opal
6.7km (4.1 miles) ⓘUnnamed Diatomite occurrence [2], Boise Mining District, Ada County, Idaho, USA
15.5km (9.6 miles) ⓘDiatomite Occurrence (MRDS - 10089089), Boise Mining District, Ada County, Idaho, USA
34.0km (21.1 miles) ⓘSquaw Butte, Emmett, Gem County, Idaho, USA
34.1km (21.2 miles) ⓘMoore Creek, Idaho City, Idaho City Mining District, Boise County, Idaho, USA
44.7km (27.8 miles) ⓘDiatomite Occurrence (MRDS - 10070230), Cascade Area, Gem County, Idaho, USA
53.6km (33.3 miles) ⓘOpaline, Owyhee County, Idaho, USA
56.9km (35.4 miles) ⓘPumice Occurrence (MRDS - 10070280), Marsing Area, Owyhee County, Idaho, USA
57.8km (35.9 miles) ⓘDiatomite Occurrence (MRDS - 10106007), Reynolds Area, Owyhee County, Idaho, USA
66.1km (41.1 miles) ⓘIdaho Almaden Mine (Nutmeg; U.S.A. Anna; Almaden; Almaden Project), Weiser Mining District, Washington County, Idaho, USA
66.9km (41.6 miles) ⓘHelen Zucker Prospect (Zucker Property; Parker Group), Weiser Mining District, Washington County, Idaho, USA
References
(2005) Mineral Resources Data System (MRDS), US Geological Survey.
 
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