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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
Šebkovice ultrapotassic lamproite dyke, Šebkovice, Třebíč District, Vysočina Region, Czech Republic


Locality type:Dike
Classification
Species:Quartz
Formula:SiO2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Quartz data
Locality Data:Click here to view Šebkovice ultrapotassic lamproite dyke, Šebkovice, Třebíč District, Vysočina Region, Czech Republic
Data Identifiers
Mindat Occurrence Record ID:757346
Long-form Identifier:1:3:757346:0
GUID (UUID V4):0
Nearest other occurrences of Quartz
2.6km (1.6 miles) ⓘKojetice metamanganolite occurrence, Kojetice, Třebíč District, Vysočina Region, Czech Republic
9.1km (5.6 miles) ⓘBítovánky quarries, Bítovánky, Želetava, Třebíč District, Vysočina Region, Czech Republic
9.2km (5.7 miles) ⓘBorovina, Třebíč, Třebíč District, Vysočina Region, Czech Republic
9.7km (6.0 miles) ⓘResidual rocks outcrop, Řípov, Třebíč, Třebíč District, Vysočina Region, Czech Republic
10.2km (6.3 miles) ⓘKostelíček, Třebíč, Třebíč District, Vysočina Region, Czech Republic
10.8km (6.7 miles) ⓘPředín phosphate occurrence, Předín, Třebíč District, Vysočina Region, Czech Republic
12.7km (7.9 miles) ⓘKožichovice II pegmatite, Kožichovice, Třebíč District, Vysočina Region, Czech Republic
12.9km (8.0 miles) ⓘKyprův mlýn quarry, Krasonice, Jihlava District, Vysočina Region, Czech Republic
13.1km (8.2 miles) ⓘHumberk Hill, Krasonice, Jihlava District, Vysočina Region, Czech Republic
15.9km (9.9 miles) ⓘKřemel Hill, Hostákov, Vladislav, Třebíč District, Vysočina Region, Czech Republic
References
Elsevier.
Krmíček, L., Cempírek J., Havlín A., Přichystal A., Houzar S, Krmíčková M, Gadas P. (2011): Mineralogy and petrogenesis of a Ba–Ti–Zr-rich peralkaline dyke from Šebkovice (Czech Republic): Recognition of the most lamproitic Variscan intrusion. In: Lithos, 121 (2011), 75-86
 
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