Argutite

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Argutite
General
Category Oxide mineral
Formula
(repeating unit)
GeO2
Strunz classification 04.DB.05
Dana classification 04.04.01.07
Crystal symmetry Tetragonal ditetragonal dipyramidal H–M Symbol (4/m 2/m 2/m)
Unit cell a = 4.3975 Å, c = 2.8625 Å; Z = 2
Identification
Formula mass 104.61
Color Grayish black, light gray in reflected light
Crystal habit Subhedral crystals, as inclusions in sphalerite
Crystal system Tetragonal
Twinning Occasionally twinned on {101}
Mohs scale hardness 6-7
Luster Vitreous - adamantine
Diaphaneity Transparent to opaque
Specific gravity 6.28 calculated
Optical properties Uniaxial (+)
Refractive index 2.01
References [1][2][3]

Argutite (GeO2) is a rare germanium oxide mineral. It is a member of the rutile group.

It was first described for an occurrence in the Argut deposit, central Pyrenees, Haute-Garonne, France in 1983.[2][3] The type locality is within a zinc ore deposit within lower Paleozoic sedimentary rocks that have undergone metamorphism. Associated minerals include sphalerite, cassiterite, siderite and briartite.[3]

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