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Formula: GeO2
Simple oxide, rutile group,
germanium-bearing mineral,
tetragonal paramorph of trigonal
pertoldite
Crystal System: Tetragonal
Specific gravity: 6.28 calculated
Hardness: 6 to 7
Colour: Light grey in reflected light
Solubility: Insoluble in water, NaOH and acids
Melting point: 1086°C
Common impurities: Zn,Mn,Fe
Environments
Localities
At the type locality, the Plan d'Argut deposit, Argut-Dessous, Saint-Gaudens, Haute-Garonne, Occitanie, France,
argutite occurs in sphalerite as 10 micron euhedral to subhedral
prismatic crystals. It is also associated with cassiterite,
siderite and rarely with
briartite
(AM 69.406-412).
The deposit is formed in metamorphosed lower Paleozoic (541.0 to 419.2 million years ago) sediments
(HOM).
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