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Arsenate

Arsenogoyazite

SrAl₃(AsO₄)(AsO₃OH)(OH)₆
Hardness4
Crystal systemHexagonal
ClassArsenate
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Arsenogoyazite specimen

Arsenogoyazite Field of view: 8 mm Locality: Kamariza Dump, Kamariza mines (Kamareza mines), Agios Konstantinos (Kamariza), Lavrion mining district, Lavreotiki, East Attica, Attica, Greece ( locality at mindat.org ) — Photo: Henk Smeets – tomeikminerals.com · CC BY 4.0

Arsenogoyazite

Arsenogoyazite is an IMA-recognized mineral species in the arsenate class, with the chemical formula SrAl₃(AsO₄)(AsO₃OH)(OH)₆.

It crystallizes in the hexagonal crystal system (space group R-3m). It is a member of the Alunite-crandallite structural group.

Key properties: Mohs hardness 4; specific gravity 3.35; Vitreous luster.

IMA symbol Agoy, IMA status: approved, named in 1983.

Found as a secondary mineral in a hydrothermal polymetallic barite–fluorite deposit (Clara mine, Germany).

It is found associated with Olivenite, cornwallite, malachite, brochantite, barian pharmacosiderite, arsenogorceixite, cualstibite, quartz, barite (Clara mine, Germany).

The name refers to arsenic in the composition, and its relation to goyazite.

Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet. Browse more A minerals or help write this entry.