Mineral Information and Data:

Argutite
GeO2 [CNMNC approved formula]

Named for the occurrence in the Argut deposit, France.

IMA status : Approved Species 1983 (IMA1980-067)
CLASSIFICATION 
Dana
(8th edition) :
04.04.01.07  
  (04) Simple Oxides
  (04.04) with a cation charge of 4+ (A++++ O2)
  (04.04.01) Rutile group (Tetragonal: P4/mnm)
  
Nickel-Strunz
(10th edition) :
04.DB.05
  (04) Oxides and Hydroxides
  (04.D) Metal:Oxygen = 1:2 and similar
  (04.DB) With medium-sized cations; chains of edge-sharing octahedra
  
Crystal system: Tetragonal System
Point group (H-M): 4/mmm (or 4/m 2/m 2/m) — ditetragonal-dipyramidal
Unit cell: a = 4.398 Å, c = 2.863 Å
Crystal Habit: Subhedral prismatic microscopic grains
Twinning: occasionally twinned on {101}
  
Color: Grayish black
Diaphaneity: Semi-transparent
Luster: Vitreous, adamantine
Hardness (Mohs): 6 - 7
Measured Density: 6.28 (calculated) g/cm3
  
Geologic Setting: In a zinc deposit formed in metamorphosed lower Paleozoic sediments.
Mineral Association: Sphalerite, cassiterite, siderite, briartite
  

 

Argutite
Sub microscopic grains of argutite invisible to the eye within sphalerite.
Origin: Rimbatz, Argut-Dessus, Haute-Garonne, Midi-Pyrénées, France.
Sample size: 2.5 x 2 x 1.5 cm
Photo: Tom Loomis

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