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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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Manganese Oxides from
Unnamed quarry ("Andradite quarry"), Kottaun, Geras, Horn District, Lower Austria, Austria


Classification
Species:'Manganese Oxides' (not an IMA approved species)
Confirmation
Validity:Unconfirmed/Questioned
Data
Mineral Data:Click here to view Manganese Oxides data
Locality Data:Click here to view Unnamed quarry ("Andradite quarry"), Kottaun, Geras, Horn District, Lower Austria, Austria
Data Identifiers
Mindat Occurrence Record ID:840705
Long-form Identifier:1:3:840705:4
GUID (UUID V4):0
Nearest other occurrences of Manganese Oxides
19.4km (12.0 miles) ⓘMarble quarry, Atzelsdorf, Brunn an der Wild, Horn District, Lower Austria, Austria
19.8km (12.3 miles) ⓘSerpentinite quarries, Dietmannsdorf an der Wild, Brunn an der Wild, Horn District, Lower Austria, Austria
24.0km (14.9 miles) ⓘÄpfelgschwendt, Göpfritz an der Wild, Zwettl District, Lower Austria, Austria
25.9km (16.1 miles) ⓘWeingartner quarry, Gars am Kamp, Horn District, Lower Austria, Austria
29.4km (18.3 miles) ⓘLimberg Quarry, Gänsgraben, Limberg, Maissau, Hollabrunn District, Lower Austria, Austria
40.0km (24.9 miles) ⓘGravel pit (Kieswerk Schauerhuber), Straß im Straßertale, Krems-Land District, Lower Austria, Austria
46.4km (28.8 miles) ⓘLower serpentinite quarry, Zwettler Leiten, Felling, Gföhl, Krems-Land District, Lower Austria, Austria
47.9km (29.8 miles) ⓘTannenfeld (Tannfeld), Maigen, Weinzierl am Walde, Krems-Land District, Lower Austria, Austria
53.5km (33.3 miles) ⓘWindeckberg, Spitz, Krems-Land District, Lower Austria, Austria
54.6km (33.9 miles) ⓘTrastallhof, Fohra, Kottes-Purk, Zwettl District, Lower Austria, Austria
References
Kolitsch, U., Knobloch, G., Schillhammer, H. & Löffler, E. (2013): 1814) Aikinit, Albit, Amphibol, Andradit, Azurit, Chalkopyrit, Epidot, Hedenbergit, Hyalith, Magnetit, Malachit, Scheelit, Titanit und Quarz aus einem neuen, kleinen Steinbruch nördlich Kottaun bei Geras, Waldviertel, Niederösterreich. Pp. 127-128 in Niedermayr, G. et al. (2013): Neue Mineralfunde aus Österreich LXII. Carinthia II, 203./123., 91-146.
 
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