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Mineralpedia Details for Sainfeldite

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Sainfeldite

Sainfeldite

Named after Paul Sainfeld, who collected the initial type material and an Honorary Curator at the National School of Mines in Paris, France. At its type locality at the Sainte-Marie-aux-Mines in France, Sainfeldite occurs as a post-mine mineral that forms as the result of the reaction between carbonate gangue minerals with arsenic solutions. Sainfeldite can additionally be found in the Czech Republic, Germany, and Morocco.

 Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/sainfeldite.pdf

Formula
Ca5(AsO4)2(AsO3OH)2ยท4H2
Crystal System
Monoclinic 
Crystal Habit
Rosette, Radial, Aggregates 
Luster
Vitreous (Glassy) 
Color
colorless, light pink 
Streak
white 
Class
Monoclinic - Prismatic 
Hardness
WebMineral
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Mindat
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Sainfeldite from Bou Azzer dist., Anti-Atlas, Morocco

Sainfeldite
            from Bou Azzer dist., Anti-Atlas, Morocco

Sainfeldite covers most of the matrix along with Picropharmacolite and Erythrite on all these specimen photos. The Sainfeldite crystals are glassy to 0.75 - 1mm, a bit murky with a lavendar or violet color. The Picropharmacolite forms large 4-5mm snow white acicular balls in radial sprays. Erythrite occurs as a secondary tiny red acicular balls.

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Sainfeldite from Wilhelm mine, Bauhaus, Richelsdorf dist., Hesse, Germany

Sainfeldite
            from Wilhelm mine, Bauhaus, Richelsdorf dist., Hesse, Germany

Light pink or light lilac pink spherical crystal aggregates to less than 0.3mm associated with purplish crystals of Erythrite.

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Sainfeldite from Bauhaus, Richelsdorf dist., Hesse, Germany

Sainfeldite
            from Bauhaus, Richelsdorf dist., Hesse, Germany

Glassy lilac crystal groups to 1mm.

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