Argutite
Argutite | |
---|---|
General | |
Category | Oxide mineral |
Formula (repeating unit) | GeO2 |
Strunz classification | 4.DB.05 |
Dana classification | 04.04.01.07 |
Crystal system |
Tetragonal Ditetragonal dipyramidal class |
Space group |
Tetragonal H–M Symbol: (4/m 2/m 2/m) Space group: P42/mnm |
Unit cell | a = 4.3975, 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 |
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]
See also
References
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