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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Schorl from
Huddlestone Mine, Rockville, Montgomery County, Maryland, USA


Locality type:Mine
Classification
Species:Schorl
Formula:NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Schorl data
Locality Data:Click here to view Huddlestone Mine, Rockville, Montgomery County, Maryland, USA
Data Identifiers
Mindat Occurrence Record ID:68753
Long-form Identifier:1:3:68753:5
GUID (UUID V4):0
Nearest other occurrences of Schorl
4.1km (2.5 miles) ⓘRock Creek, Montgomery County, Maryland, USA
4.2km (2.6 miles) ⓘAyrlawn Park, Bethesda, Montgomery County, Maryland, USA
4.5km (2.8 miles) ⓘHalpine Crushed-schist Quarry, Aspen Hill, Montgomery County, Maryland, USA
5.6km (3.5 miles) ⓘCabin John Creek, Montgomery County, Maryland, USA
7.5km (4.7 miles) ⓘAspen Hill, Montgomery County, Maryland, USA
9.0km (5.6 miles) ⓘMaryland Mine (Allen shaft), Potomac, Montgomery County, Maryland, USA
11.3km (7.0 miles) ⓘKensington Mica Mine (Gilmore Mine; B. H. Warner Mine), Wheaton, Montgomery County, Maryland, USA
11.4km (7.1 miles) ⓘLamberton Branch locality, Silver Spring, Montgomery County, Maryland, USA
21.9km (13.6 miles) ⓘEarth Products Company Mines, Montgomery County, Maryland, USA
22.0km (13.7 miles) ⓘPatuxent River Bridge, Route 29, Scaggsville, Howard County, Maryland, USA
References
Rocks & Min.:11:8 & 121
14:305.
AM. MINERALOGIST, V. 18, 312-313.
 
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