Argutit
| Argutit | |
|---|---|
| General and classification | |
| other names |
IMA 1980-067 |
| chemical formula | GeO 2 |
|
Mineral class (and possibly department) |
Oxides and hydroxides |
|
System no. to Strunz and to Dana |
4.DB.05 ( 8th edition : IV / D.02) 04.04.01.07 |
| Crystallographic Data | |
| Crystal system | tetragonal |
| Crystal class ; symbol | 4 / mmm - ditetragonal-dipyramidal |
| Space group | P 4 2 / mnm |
| Lattice parameters | a = 4.398 Å ; c = 2.863 Å Please complete the source as an individual reference |
| Formula units | Z = 2 Please complete the source as an individual reference |
| Twinning | sometimes along {101} |
| Physical Properties | |
| Mohs hardness | 6 to 7 |
| Density (g / cm 3 ) | 6.28 |
| Cleavage | Please complete |
| colour | grey black |
| Line color | Please complete |
| transparency | translucent |
| shine | Please complete |
Argutite , chemically germanium (IV) oxide , is a very rare mineral from the mineral class of oxides and hydroxides . It crystallizes in the tetragonal crystal system with the chemical composition GeO 2 and forms hypidiomorphic crystals up to 20 μm in size, embedded in sphalerite .
Etymology and history
The mineral was first discovered in 1983 by Z. Johan, E. Oudin and P. Picot in a deposit near Argut-Dessous in the French department of Haute-Garonne and named after them.
classification
In the Strunz system , argutite is counted among the oxides with a ratio of metal to oxygen of 1: 2. After the 8th edition and 9th edition , it forms the rutile group with pyrolusite , cassiterite , paratellurite , plattnerite , rutile and tripuhyite , and in the ninth edition, tugarinovite and varlamoffite .
In the Dana system , it forms the rutile group with ilmenorutil , rutile, struverite , cassiterite, plattnerite, pyrolusite, squawcreekite and stishovite , a subgroup of the simple oxides with a cation charge of 4+.
Education and Locations
Argutite formed in a zinc deposit in metamorphic sedimentary rock. It is associated with sphalerite, cassiterite, siderite and briartite .
In addition to the type locality , some other finds are known in Couflens and Saint-Girons in the Ariège department , Luchon and Saint-Béat in the Haute-Garonne department and Lourdes in the Hautes-Pyrénées department (all France).
Crystal structure
Argutite crystallizes in the tetragonal crystal system in the space group P 4 2 / mnm with the lattice parameters a = 4.398 Å and c = 2.863 Å, as well as two formula units per unit cell .
See also
Individual evidence
literature
- Argutit in: Anthony et al .: Handbook of Mineralogy , 1990, 1, 101 ( pdf ).