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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Tourmaline from
Eagle Mine (Morgan and Rappahannock; Smith), Gold-Pyrite Belt, Stafford County, Virginia, USA


Locality type:Mine
Classification
Species:'Tourmaline' (not an IMA approved species)
Formula:AD3G6(T6O18)(BO3)3X3Z
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Tourmaline data
Locality Data:Click here to view Eagle Mine (Morgan and Rappahannock; Smith), Gold-Pyrite Belt, Stafford County, Virginia, USA
Data Identifiers
Mindat Occurrence Record ID:345155
Long-form Identifier:1:3:345155:7
GUID (UUID V4):0
Nearest other occurrences of Tourmaline
17.3km (10.7 miles) ⓘFranklin Mine (Deep Run Mine), Midland, Gold-Pyrite Belt, Fauquier County, Virginia, USA
31.3km (19.5 miles) ⓘSaunders Prospect, Gold-Pyrite Belt, Orange County, Virginia, USA
31.8km (19.8 miles) ⓘCabin Branch Mine (Dumfries Mine), Dumfries, Gold-Pyrite Belt, Prince William County, Virginia, USA
38.5km (23.9 miles) ⓘLast Mile Mine, Ladysmith, Caroline County, Virginia, USA
45.9km (28.5 miles) ⓘVulcan Materials Company Crushed Stone Quarry (Manassas Quarry), Manassas, Prince William County, Virginia, USA
56.0km (34.8 miles) ⓘBull Run Quarry, Conklin, Loudoun County, Virginia, USA
69.0km (42.9 miles) ⓘMoss Mine, Tabscott, Gold-Pyrite Belt, Goochland County, Virginia, USA
72.9km (45.3 miles) ⓘManassas Gap Mine, Northern Section-Blue Ridge Province, Fauquier County, Virginia, USA
74.8km (46.5 miles) ⓘDifficult Run, Fairfax County, Virginia, USA
86.0km (53.4 miles) ⓘHunting Hill Quarry, Rockville, Montgomery County, Maryland, USA
References
(2005) Mineral Resources Data System (MRDS), US Geological Survey.
 
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