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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Coalingite from
Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA


07486920017271922197895.jpg
Coalingite

Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
02827170017271922225362.jpg
Coalingite

Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
07302960017272021829217.jpg
Coalingite, etc.

Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
02831080017272021844342.jpg
Coalingite

Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
04845420017363139996363.jpg
Coalingite

Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
07542660017363139999500.jpg
Coalingite

Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
09292840017363139997102.jpg
Coalingite, etc.

Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
00878180017363140006433.jpg
Coalingite

Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
07486920017271922197895.jpg
Coalingite

Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
09987970017272021855408.jpg
Coalingite

Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
07302960017272021829217.jpg
Coalingite, etc.

Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
02831080017272021844342.jpg
Coalingite

Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
Locality type:Quarry
Classification
Species:Coalingite
Formula:Mg10Fe23+(OH)24[CO3] · 2H2O
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Calcite3
Talc2
Magnetite2
Magnesite1
Serpentine Subgroup1
Data
Mineral Data:Click here to view Coalingite data
Locality Data:Click here to view Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
Photo GalleryView Gallery (10 photos)
Data Identifiers
Mindat Occurrence Record ID:46599
Long-form Identifier:1:3:46599:7
GUID (UUID V4):0
References
Bernstein, Lawrence R. (1980) Minerals of the Washington, D.C. Area - Issue 5 of Educational series, Maryland Geological Survey. Department of Natural Resources, Maryland Geological Survey. p.1-148.
 
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