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Formula: CaAl3(AsO4)(AsO3OH)(OH)6
Hydrated arsenate containing hydroxyl,
dussertite group
Crystal System: Trigonal
Specific gravity: 3.25 measured, 3.30 calculated
Hardness: 5½
Streak: White
Colour: White, creamy yellowish white, also blue to bluish green
Luminescence: Not fluorescent under UV
Solubility: Partially dissolved by cold 1:1 hydrochloric or nitric acid, and dissolves slowly in hot 1:1 hydrochloric
acid
(Dana)
Environments
Arseocrandallite occurs in the secondary oxidation zone
of hydrothermal deposits (Mindat)
Localities
At the type locality, Neubulach, Calw, Karlsruhe Region, Baden-Württemberg, Germany, arsenocrandallite was
found as a secondary mineral on specimens from the mine dump.
It forms reniform
crusts and spherulitic aggregates up to 0.1 mm. Associated minerals include
brochantite,
chalcophyllite,
parnauite, arseniosiderite,
mansfieldite,
bariopharmacosiderite,
bulachite,
azurite, malachite,
baryte, goethite,
quartz and corroded tennantite
(AM 67.854, HOM).
At the Centennial Eureka Mine, Eureka, Tintic Mining District, Juab County, Utah, USA, arsenocrandallite is
associated with arsenogoyazite,
beudantite and olivenite
(HOM).
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