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

Argutite
General
CategoryOxide mineral
Formula
(repeating unit)
GeO2
IMA symbolAgt[1]
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
LusterVitreous - adamantine
DiaphaneityTransparent to opaque
Specific gravity6.28 calculated
Optical propertiesUniaxial (+)
Refractive index2.01
References[2][3][4]

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

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References

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  1. ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  2. ^ Webmineral
  3. ^ a b Mindat.org
  4. ^ a b c Handbook of Mineralogy