Chemistry:Argutite

From HandWiki
Argutite
General
CategoryOxide mineral
Formula
(repeating unit)
GeO2
Strunz classification4.DB.05
Dana classification04.04.01.07
Crystal systemTetragonal
Ditetragonal dipyramidal class
Space groupTetragonal
H–M Symbol: (4/m 2/m 2/m)
Space group: P42/mnm
Unit cella = 4.3975, c = 2.8625 [Å]; Z = 2
Identification
Formula mass104.61
ColorGrayish black, light gray in reflected light
Crystal habitSubhedral crystals, as inclusions in sphalerite
TwinningOccasionally twinned on {101}
Mohs scale hardness6-7
|re|er}}Vitreous - adamantine
DiaphaneityTransparent to opaque
Specific gravity6.28 calculated
Optical propertiesUniaxial (+)
Refractive index2.01
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