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Mcnearite from
Gabe Gottes Mine, Sankt Jakob vein, Neuenberg, Ste Marie-aux-Mines (Markirch), Haut-Rhin, Alsace, France

Mineral Species
Species:Mcnearite
Formula:NaCa5(AsO4)(HAsO4)4 · 4H2O
Description
Type Locality:Gabe Gottes Mine, Sankt Jakob vein, Neuenberg, Ste Marie-aux-Mines (Markirch), Haut-Rhin, Alsace, France is the type locality for Mcnearite
Comments:The macnearite samples come from crosscut "Tiefstollen" in a part of gallery which has served for the Gabe-Gottes and Saint-Jacques mines arsenic ore storage.
The minerals associated with macnearite are picropharmacolite, pharmacolite, guérinite and haidingerite.
The formation of this mineral is certainly due to the arsenic acid reaction with the carbonate gangue mineral. The presence of sodium must be linked to the abundance of mirabilite that lines the walls of this gallery (WEIL, 1937).
Quality of samples:not specified / average specimens
Confirmation
Validity:Believed Valid
References
References:Sarp, H., Deferne, J., Liebich, B. W. (1981): La mcnearite, NaCa5H4(AsO4)5•4H2O, un nouvel arséniate hydraté de calcium et de sodium. Schweizerische Mineralogische und Petrographische Mitteilungen 61, 1-6.
Data
Mineral Data:Click here to view Mcnearite data
Locality Data:Click here to view Gabe Gottes Mine, Sankt Jakob vein, Neuenberg, Ste Marie-aux-Mines (Markirch), Haut-Rhin, Alsace, France
Nearest other occurrences of Mcnearite
0.9km (0.6 miles) A Neuenberg, Ste Marie-aux-Mines (Markirch), Haut-Rhin, Alsace, France
Mineral and/or Locality  
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