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


04284830017272735771108.jpg
Magnesite, etc.

Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
07946740017272022301544.jpg
Magnesite

Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
06138800017272022344422.jpg
Magnesite

Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
04155460017406109998220.jpg
Magnesite, etc.

Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
07083800017406109995934.jpg
Magnesite, etc.

Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
08489200017406109996333.jpg
Magnesite

Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
03076220017364695425769.jpg
Magnesite

Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
04344490017370852822831.jpg
Magnesite, etc.

Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
06354340017272735777884.jpg
Magnesite, etc.

Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
07946740017272022301544.jpg
Magnesite

Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
06138800017272022344422.jpg
Magnesite

Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
04170870017406110005952.jpg
Magnesite, etc.

Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
Locality type:Quarry
Classification
Species:Magnesite
Formula:MgCO3
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Dolomite5
Serpentine Subgroup5
Brucite4
Tochilinite3
Magnetite3
Clinochlore3
Antigorite2
Mcguinnessite2
Calcite2
Pyroaurite1
Limonite1
Manganese Oxides1
Coalingite1
Data
Mineral Data:Click here to view Magnesite data
Locality Data:Click here to view Hunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
Photo GalleryView Gallery (5 photos)
Data Identifiers
Mindat Occurrence Record ID:46607
Long-form Identifier:1:3:46607:5
GUID (UUID V4):0
Nearest other occurrences of Magnesite
20.6km (12.8 miles) ⓘEtchison Mine, Montgomery County, Maryland, USA
22.4km (13.9 miles) ⓘEdnor Steatite Locality, Ednor, Montgomery County, Maryland, USA
49.4km (30.7 miles) ⓘLord Baltimore Drive Quartz occurrence area, Windsor Mill, Baltimore County, Maryland, USA
49.5km (30.8 miles) ⓘWeir Mine, Holbrook, Baltimore County, Maryland, USA
50.0km (31.1 miles) ⓘHarris Mine, Holbrook, Baltimore County, Maryland, USA
50.2km (31.2 miles) ⓘChoate Mine, Owings Mills, Baltimore County, Maryland, USA
50.9km (31.6 miles) ⓘUnnamed Chromite prospect 13 [of Pearre & Heyl], Owings Mills, Baltimore County, Maryland, USA
52.7km (32.7 miles) ⓘDelight Quarry (Soldier's Delight Quarry; Dyer Quarry), Soldiers' Delight ridge, Delight, Baltimore County, Maryland, USA
59.3km (36.8 miles) ⓘDiscovery workings (Main workings), Bare Hills, Baltimore County, Maryland, USA
59.4km (36.9 miles) ⓘUnnamed Chromite prospects, Bare Hills, Baltimore County, Maryland, USA
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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