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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Biotite from
Loučná pod Klínovcem, Chomutov District, Ústí nad Labem Region, Czech Republic


Locality type:Municipality
Classification
Species:'Biotite' (not an IMA approved species)
Formula:K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
Comments:mica´s sheets to 20 mm are common in xenolites and some types of volcanic rock
Habit:pseudohexagonal tabular and sheet crystals
Colour:dark brown to black
Quality for species:Poor for species, only of interest for locality collectors. (#)
Confirmation
Validity:Confirmed
Confirmation Methods:Visually Identified
Data
Mineral Data:Click here to view Biotite data
Locality Data:Click here to view Loučná pod Klínovcem, Chomutov District, Ústí nad Labem Region, Czech Republic
Data Identifiers
Mindat Occurrence Record ID:916626
Long-form Identifier:1:3:916626:4
GUID (UUID V4):0
Nearest other occurrences of Biotite
8.7km (5.4 miles) ⓘMagnetite Mine, Měděnec, Chomutov District, Ústí nad Labem Region, Czech Republic
8.9km (5.5 miles) ⓘVykmanov, Ostrov, Karlovy Vary District, Karlovy Vary Region, Czech Republic
14.5km (9.0 miles) ⓘPodlesí stock, Potůčky Deposit, Potůčky, Karlovy Vary District, Karlovy Vary Region, Czech Republic
19.5km (12.1 miles) ⓘSatzung, Marienberg, Erzgebirgskreis, Saxony, Germany
21.9km (13.6 miles) ⓘGeyer SW skarn, Geyer, Erzgebirgskreis, Saxony, Germany
24.9km (15.5 miles) ⓘSauberg Mine, Ehrenfriedersdorf, Erzgebirgskreis, Saxony, Germany
25.9km (16.1 miles) ⓘHabichtsleithe, Aue, Aue-Bad Schlema, Erzgebirgskreis, Saxony, Germany
26.0km (16.2 miles) ⓘGreifensteine, Ehrenfriedersdorf, Erzgebirgskreis, Saxony, Germany
30.0km (18.7 miles) ⓘVater Abraham Mine, Lauta, Marienberg, Erzgebirgskreis, Saxony, Germany
32.5km (20.2 miles) ⓘSerpentinite quarry, Zöblitz, Marienberg, Erzgebirgskreis, Saxony, Germany
References
Gramblička, Roman (n.d.) Personal communication.
 
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