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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Willemite from
Genna zinc smelter slag locality, Helmke quarry nature reserve, Letmathe, Iserlohn, Märkischer Kreis, Arnsberg, North Rhine-Westphalia, Germany


08588060017366000037694.jpg
Willemite

Genna zinc smelter slag locality, Helmke quarry nature reserve, Letmathe, Iserlohn, Märkischer Kreis, Arnsberg, North Rhine-Westphalia, Germany
08588060017366000037694.jpg
Willemite

Genna zinc smelter slag locality, Helmke quarry nature reserve, Letmathe, Iserlohn, Märkischer Kreis, Arnsberg, North Rhine-Westphalia, Germany
08009490017271987926481.jpg
Willemite

Genna zinc smelter slag locality, Helmke quarry nature reserve, Letmathe, Iserlohn, Märkischer Kreis, Arnsberg, North Rhine-Westphalia, Germany
Locality type:Slag Locality
Classification
Species:Willemite
Formula:Zn2SiO4
Formation:Post-mining/Anthropogenic
Comments:As crusts, mixtures and as blue, incompletely formed crystals; as yellow, yellow-brown or brown coral-like hexagonal crystal aggregates up to 2mm; as reddish brown thick tabular crystals; as brown long-prismatic crystals up to 1.5mm.
Confirmation
Validity:Believed Valid
Associated Minerals Based on Photo Data:
Zincite2
Serpierite2
Cassiterite1
Anglesite1
Zincaluminite1
Data
Mineral Data:Click here to view Willemite data
Locality Data:Click here to view Genna zinc smelter slag locality, Helmke quarry nature reserve, Letmathe, Iserlohn, Märkischer Kreis, Arnsberg, North Rhine-Westphalia, Germany
Photo GalleryView Gallery (2 photos)
Data Identifiers
Mindat Occurrence Record ID:76095
Long-form Identifier:1:3:76095:3
GUID (UUID V4):0
References
Verein der Hegauer Mineralienfreunde (1983) Rezente Mineralbildungen in den Schlacken ehemaliger Erzverhüttung. Mineralien-Magazin, 9/1983, 411-413.
Schnorrer-Köhler, G. (1983) Die Minerale der Schlackenhalde der ehemaligen Zinkhütte Genna in Letmathe/Sauerland. Der Aufschluss, 34(2), 89-99.
Schnorrer-Köhler, G. (1986) Neue Minerale von der Schlackenhalde der ehemaligen Zinkhütte Genna in Letmathe/Sauerland. Aufschluss, 37 (2), 55-67.
Bender, D.; Krimmelbein, W. (1994) Aktuelle Übersicht: Mineralien der Zinkhütte Genna/Sauerland [Current overview: Minerals from the Genna/Sauerland zinc smelter]. Mineralien Welt, 5 (4). 10
 
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