Images
Formula: Ca(AsO3OH).H2O
Hydrated hydrogen arsenate
Crystal System: Orthorhombic
Specific gravity: 2.848 measured, 2.971 calculated
Hardness: 2 to 2½
Streak: White
Colour: Colourless, white; colourless in transmitted light
Environments
Haidingerite is an oxidation product of arsenical ores
(Webmin).
Associated minerals include pharmacolite,
pitticite
and weilite
(HOM, Mindat).
Localities
The type locality is Jáchymov, Karlovy Vary District, Karlovy Vary Region, Czech Republic.
Haidingerite from Jáchymov - Image
The Bou Azzer mining district, Drâa-Tafilalet Region, Morocco. Haidingerite is also found here
(MinRec 38.5.404).
At the Getchell Mine, Adam Peak, Potosi Mining District, Osgood mountains, Humboldt county, Nevada, USA, haidingerite
is formed by dehydration of pharmacolite
(HOM).
Haidingerite from the Getchell Mine-
Image
At the White Caps Mine, Manhattan, Toquima Range, Nye county, Nevada, USA, haidingerite is found as an oxidation product of
arsenical ores in association with pharmacolite
(Dana).
Haidingerite from the White Caps Mine -
Image
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