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
Irma Mine, Cropley, 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 Irma Mine, Cropley, Montgomery County, Maryland, USA
Data Identifiers
Mindat Occurrence Record ID:453270
Long-form Identifier:1:3:453270:5
GUID (UUID V4):0
Nearest other occurrences of Quartz
0.4km (0.2 miles) ⓘSawyer Mine, Cropley, Montgomery County, Maryland, USA
0.9km (0.6 miles) ⓘLynch Mine, Cropley, Montgomery County, Maryland, USA
2.8km (1.7 miles) ⓘMaryland Mine (Allen shaft), Potomac, Montgomery County, Maryland, USA
3.0km (1.9 miles) ⓘMontgomery Mine (Potomac Mine), Potomac, Montgomery County, Maryland, USA
3.3km (2.1 miles) ⓘWatson Mine (Anderson Property; Potomac and Watson Mine), Potomac, Montgomery County, Maryland, USA
3.7km (2.3 miles) ⓘCabin John Creek, Montgomery County, Maryland, USA
3.9km (2.5 miles) ⓘStanmore Drive, Potomac, Montgomery County, Maryland, USA
4.2km (2.6 miles) ⓘDifficult Run, Fairfax County, Virginia, USA
4.5km (2.8 miles) ⓘFord Mine, Potomac, Montgomery County, Maryland, USA
6.5km (4.1 miles) ⓘBethesda Mine (Miller Mine), Bethesda, Montgomery County, Maryland, USA
References
(2005) Mineral Resources Data System (MRDS), US Geological Survey.
 
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