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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Fibroferrite from
Black Iron Mine (Eagle No. 2 Mine; Iron Mask), Gilman, Gilman Mining District (Battle Mountain Mining District; Red Cliff Mining District), Eagle County, Colorado, USA


Locality type:Mine
Classification
Species:Fibroferrite
Formula:Fe3+(SO4)(OH) · 5H2O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Fibroferrite data
Locality Data:Click here to view Black Iron Mine (Eagle No. 2 Mine; Iron Mask), Gilman, Gilman Mining District (Battle Mountain Mining District; Red Cliff Mining District), Eagle County, Colorado, USA
Data Identifiers
Mindat Occurrence Record ID:49504
Long-form Identifier:1:3:49504:0
GUID (UUID V4):0
Nearest other occurrences of Fibroferrite
1.6km (1.0 miles) ⓘEagle Mine, Gilman, Gilman Mining District (Battle Mountain Mining District; Red Cliff Mining District), Eagle County, Colorado, USA
References
Dana 6:1089.
 
and/or  
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