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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Opal from
Těškov quarry (Lom Knezska hora), Těškov, Rokycany District, Plzeň Region, Czech Republic


Locality type:Quarry
Classification
Species:Opal
Formula:SiO2 · nH2O
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Opal data
Locality Data:Click here to view Těškov quarry (Lom Knezska hora), Těškov, Rokycany District, Plzeň Region, Czech Republic
Data Identifiers
Mindat Occurrence Record ID:348303
Long-form Identifier:1:3:348303:9
GUID (UUID V4):0
Nearest other occurrences of Opal
53.9km (33.5 miles) ⓘValeč Hyalite occurrences, Valeč, Karlovy Vary District, Karlovy Vary Region, Czech Republic
57.5km (35.7 miles) ⓘRadvanka quarry, Hejná, Klatovy District, Plzeň Region, Czech Republic
58.3km (36.2 miles) ⓘKrty quarries, Krty-Hradec, Strakonice District, South Bohemian Region, Czech Republic
60.7km (37.7 miles) ⓘVlčí hora, Černošín, Tachov District, Plzeň Region, Czech Republic
66.6km (41.4 miles) ⓘBezděkov, Tachov District, Plzeň Region, Czech Republic
70.1km (43.6 miles) ⓘNástup Quarry, Tušimice, Kadaň, Chomutov District, Ústí nad Labem Region, Czech Republic
71.7km (44.6 miles) ⓘSvatá Anna, Dolní Jadruž, Chodský Újezd, Tachov District, Plzeň Region, Czech Republic
72.0km (44.7 miles) ⓘLibous quarry, Březno, Chomutov District, Ústí nad Labem Region, Czech Republic
74.7km (46.4 miles) ⓘKorozluky magmatic rock occurrence (Kolosoruk magmatic rock occurrence; Kolloseruk magmatic rock occurrence), Korozluky, Most District, Ústí nad Labem Region, Czech Republic
75.3km (46.8 miles) ⓘOpal occurrence, Opal occurrence, Lužice, Most District, Ústí nad Labem Region, Czech Republic
References
Janouš, F. (1995): Minerály z Kněží hory u Těškova (okres Rokycany). Minerál, 3 (6), 367-369.
 
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