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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Amethyst from
Alva Silver Mine, Silver Glen, Alva, Clackmannanshire, Scotland, UK


Locality type:Mine
Classification
Species:Quartz var: Amethyst
Formula:SiO2
Comments:From amygdales in surrounding lavas.
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Amethyst data
Locality Data:Click here to view Alva Silver Mine, Silver Glen, Alva, Clackmannanshire, Scotland, UK
Data Identifiers
Mindat Occurrence Record ID:43369
Long-form Identifier:1:3:43369:7
GUID (UUID V4):0
Nearest other occurrences of Amethyst
30.4km (18.9 miles) ⓘSouth Queensferry, City of Edinburgh, Scotland, UK
31.9km (19.8 miles) ⓘBinn Hill, Glenfarg, Perth and Kinross, Scotland, UK
35.9km (22.3 miles) ⓘBurnt-Island, Fife, Scotland, UK
38.9km (24.2 miles) ⓘCorstorphine Hill, City of Edinburgh, Scotland, UK
39.1km (24.3 miles) ⓘPettycur, Fife, Scotland, UK
39.7km (24.7 miles) ⓘNewburgh, Fife, Scotland, UK
43.1km (26.8 miles) ⓘCraiglockhart, City of Edinburgh, Scotland, UK
45.6km (28.3 miles) ⓘBlackford Hill Quarry, City of Edinburgh, Scotland, UK
46.9km (29.1 miles) ⓘNorman's Law, Cupar, Fife, Scotland, UK
48.4km (30.1 miles) ⓘLinn Park (Cathcart Castle), Glasgow City, Scotland, UK
References
[J.Russell Soc 1998:23]
 
and/or  
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