Argutite
(repeating unit)GeO2 IMA symbol Agt[1] 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 [2][3][4]
Ditetragonal dipyramidal class
H–M Symbol: (4/m 2/m 2/m)
Space group: P42/mnm
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.[3][4] 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.[4]
See also
References
- v
- t
- e