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Guérinite & Sainfeldite & Erythrite

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MGR660961

Guérinite & Sainfeldite & Erythrite

Description Tabs

Description
Locality: 
Wilhelm Mine, Nentershausen, Kassel Region, Hesse, Germany
Class: 
Combination
Size Range: 
Thumbnail (1-3cm)
Size: 
2.7 × 2.2 × 1.7 cm
Description

White crystals of guerinite in combination with aggregates of sainfeldite and erithrine. This very rare monoclinic phosphate was named for Henry Guerin (died in 1960), a chemist at the Paris Sud Univerity. The mineral was found only in six nations, type locality is also in Germany (Daniel Mine). No significant demages to report.

Mineral Data
What's on the rock

Guérinite

Formula: 
Ca5(AsO4)2(HAsO4)2·9H2O
Strunz: 
8.CJ.75
Crystal System: 
Monoclinic
Hardness: 
1.5
Colour: 
Colorless
Streak: 
White
Type Locality: 
Daniel Mine (St. Daniel Mine), Neustädtel, Schneeberg District, Erzgebirge, Saxony, Germany

Sainfeldite

Formula: 
CaCa2Ca2(AsO4)2(HAsO4)2·4H2O
Strunz: 
8.CB.10
Crystal System: 
Monoclinic
Hardness: 
4.0
Streak: 
White
Type Locality: 
Gabe Gottes Mine (incl. Giftgrube), Neuenberg, Ste Marie-aux-Mines (Markirch), Haut-Rhin, Alsace, France

Erythrite

Formula: 
Co3(AsO4)2·8H2O
Strunz: 
8.CE.40
Hardness: 
1.5 - 2.5
Type Locality: 
Daniel Mine (St. Daniel Mine), Neustädtel, Schneeberg District, Erzgebirge, Saxony, Germany