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


Locality type:Mine
Classification
Species:Quartz
Formula:SiO2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Quartz data
Locality Data:Click here to view Huddlestone Mine, Rockville, Montgomery County, Maryland, USA
Data Identifiers
Mindat Occurrence Record ID:68754
Long-form Identifier:1:3:68754:4
GUID (UUID V4):0
Nearest other occurrences of Quartz
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
4.7km (2.9 miles) ⓘBethesda Mine (Miller Mine), Bethesda, Montgomery County, Maryland, USA
5.6km (3.5 miles) ⓘCabin John Creek, Montgomery County, Maryland, USA
6.7km (4.2 miles) ⓘMontgomery Mine (Potomac Mine), Potomac, Montgomery County, Maryland, USA
7.1km (4.4 miles) ⓘLynch Mine, Cropley, Montgomery County, Maryland, USA
7.5km (4.7 miles) ⓘAspen Hill, Montgomery County, Maryland, USA
7.7km (4.8 miles) ⓘSawyer Mine, Cropley, Montgomery County, Maryland, USA
7.7km (4.8 miles) ⓘIrma Mine, Cropley, Montgomery County, Maryland, USA
References
Rocks & Min.:11:8 & 121.
AM. MINERALOGIST, V. 18, 312-313.
 
and/or  
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