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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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Schorl from
U údražského obrázku quarry, Údraž, Albrechtice nad Vltavou, Písek District, South Bohemian Region, Czech Republic


08660820017365966812079.jpg
Schorl

U údražského obrázku quarry, Údraž, Albrechtice nad Vltavou, Písek District, South Bohemian Region, Czech Republic
07847170017272302593698.jpg
Schorl

U údražského obrázku quarry, Údraž, Albrechtice nad Vltavou, Písek District, South Bohemian Region, Czech Republic
00745060017272302607193.jpg
Schorl

U údražského obrázku quarry, Údraž, Albrechtice nad Vltavou, Písek District, South Bohemian Region, Czech Republic
08210890017272726006161.jpg
Schorl

U údražského obrázku quarry, Údraž, Albrechtice nad Vltavou, Písek District, South Bohemian Region, Czech Republic
07847170017272302593698.jpg
Schorl

U údražského obrázku quarry, Údraž, Albrechtice nad Vltavou, Písek District, South Bohemian Region, Czech Republic
00745060017272302607193.jpg
Schorl

U údražského obrázku quarry, Údraž, Albrechtice nad Vltavou, Písek District, South Bohemian Region, Czech Republic
01990200017367557303382.jpg
Schorl

U údražského obrázku quarry, Údraž, Albrechtice nad Vltavou, Písek District, South Bohemian Region, Czech Republic
07847170017272302593698.jpg
Schorl

U údražského obrázku quarry, Údraž, Albrechtice nad Vltavou, Písek District, South Bohemian Region, Czech Republic
00745060017272302607193.jpg
Schorl

U údražského obrázku quarry, Údraž, Albrechtice nad Vltavou, Písek District, South Bohemian Region, Czech Republic
Locality type:Quarry
Classification
Species:Schorl
Formula:NaFe32+Al6(Si6O18)(BO3)3(OH)3(OH)
Confirmation
Validity:Confirmed
Confirmation Methods:Visually Identified
Data
Mineral Data:Click here to view Schorl data
Locality Data:Click here to view U údražského obrázku quarry, Údraž, Albrechtice nad Vltavou, Písek District, South Bohemian Region, Czech Republic
Photo GalleryView Gallery (3 photos)
Data Identifiers
Mindat Occurrence Record ID:720893
Long-form Identifier:1:3:720893:5
GUID (UUID V4):0
Nearest other occurrences of Schorl
6.6km (4.1 miles) ⓘU obrázku quarry (Obrázek I quarry), Písek District, South Bohemian Region, Czech Republic
8.2km (5.1 miles) ⓘPtáčkovna quarry, Písek, Písek District, South Bohemian Region, Czech Republic
33.6km (20.9 miles) ⓘKobylí hora quarry, Prachatice, Prachatice District, South Bohemian Region, Czech Republic
34.4km (21.4 miles) ⓘParagneiss occurrences, Zvěrotice, Tábor District, South Bohemian Region, Czech Republic
37.1km (23.0 miles) ⓘNová Ves pegmatite, Nová Ves, Český Krumlov District, South Bohemian Region, Czech Republic
37.1km (23.1 miles) ⓘHrušova Lhota quartz occurrence, Hrušova Lhota, Přehořov, Tábor District, South Bohemian Region, Czech Republic
43.5km (27.0 miles) ⓘPacova Hill quarry, Dolní Hořice, Tábor District, South Bohemian Region, Czech Republic
48.1km (29.9 miles) ⓘPegmatite occurrences, Dolní Svince, Dolní Třebonín, Český Krumlov District, South Bohemian Region, Czech Republic
53.7km (33.4 miles) ⓘRoudný deposit, Benešov District, Central Bohemian Region, Czech Republic
58.9km (36.6 miles) ⓘHomolka Hill, Stráž nad Nežárkou, Jindřichův Hradec District, South Bohemian Region, Czech Republic
References
A. Tomek photo
 
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