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
Kahlenberg quarry, Londorf, Rabenau, Giessen, Giessen Region, Hesse, Germany


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 Kahlenberg quarry, Londorf, Rabenau, Giessen, Giessen Region, Hesse, Germany
Data Identifiers
Mindat Occurrence Record ID:989089
Long-form Identifier:1:3:989089:3
GUID (UUID V4):0
Nearest other occurrences of Opal
9.2km (5.7 miles) ⓘAttenberg quarry, Großen-Buseck, Buseck, Giessen, Giessen Region, Hesse, Germany
10.8km (6.7 miles) ⓘHochberg quarry (Hohenberg quarry), Nieder-Ofleiden, Homberg, Vogelsbergkreis, Giessen Region, Hesse, Germany
17.7km (11.0 miles) ⓘSchiffenberg quarry, Hausen, Pohlheim, Giessen, Giessen Region, Hesse, Germany
20.3km (12.6 miles) ⓘBasalt quarry, Gonterskirchen, Laubach, Giessen, Giessen Region, Hesse, Germany
21.1km (13.1 miles) ⓘDünsberg, Königsberg, Biebertal, Giessen, Giessen Region, Hesse, Germany
24.0km (14.9 miles) ⓘMaykranz Quarry, Langd, Hungen, Giessen, Giessen Region, Hesse, Germany
28.0km (17.4 miles) ⓘOber-Widdersheim quarry, Ober-Widdersheim, Nidda, Wetteraukreis, Darmstadt, Hesse, Germany
31.6km (19.7 miles) ⓘHohenstein quarry, Nidda, Wetteraukreis, Darmstadt, Hesse, Germany
34.6km (21.5 miles) ⓘBasalt quarry, Bingenheim, Echzell, Wetteraukreis, Darmstadt, Hesse, Germany
35.6km (22.1 miles) ⓘBasalt quarry, Blofeld, Reichelsheim, Wetteraukreis, Darmstadt, Hesse, Germany
References
Weiß, Stefan (1990) Mineralfundstellen Atlas Deutschland West. Christian Weise Verlag, Munich, Germany. 320pp.
 
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