Artinite
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Artinite | |
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![]() Artinite from New Idria District, California | |
General | |
Category | Carbonate mineral |
Formula (repeating unit) | Mg2(OH)2CO3·3H2O |
IMA symbol | Art[1] |
Strunz classification | 5.DA.10 |
Crystal system | Monoclinic |
Crystal class | Prismatic (2/m) (same H-M symbol) |
Space group | C2/m |
Unit cell | a = 16.56, b = 3.15 c = 6.22 [Å]; β = 99.15°; Z = 2 |
Identification | |
Color | White |
Crystal habit | Acicular crystals, fibrous veinlets, botryoidal crusts, and spherical aggregates |
Cleavage | On {100} perfect; on {001} good. |
Mohs scale hardness | 2.5 |
Luster | Vitreous, silky |
Streak | White |
Diaphaneity | Transparent |
Specific gravity | 2.01 - 2.03 |
Optical properties | Biaxial (-) |
Refractive index | nα = 1.488 - 1.489 nβ = 1.533 - 1.534 nγ = 1.556 - 1.557 |
Birefringence | δ = 0.068 |
References | [2][3][4] |
Artinite is a hydrated magnesium carbonate mineral with formula: Mg2(CO3)(OH)2·3H2O. It forms white silky monoclinic prismatic crystals that are often in radial arrays or encrustations. It has a Mohs hardness of 2.5 and a specific gravity of 2.
It occurs in low-temperature hydrothermal veins and in serpentinized ultramafic rocks. Associated minerals include brucite, hydromagnesite, pyroaurite, chrysotile, aragonite, calcite, dolomite and magnesite.[2]
It was first reported in 1902 in Lombardy, Italy. It was named for Italian mineralogist, Ettore Artini (1866–1928).[3]
![](https://upload.wikimedia.org/wikipedia/commons/thumb/b/b3/Artinite-148070.jpg/300px-Artinite-148070.jpg)
Artinite sometimes forms balls of radiating, fibrous crystals. Specimen from New Idria district, California US. Size: 9.2 x 5.2 x 1.5 cm.
References
- ^ 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.
- ^ a b Handbook of Mineralogy
- ^ a b Artinite on Mindat.org
- ^ Artinite on Webmineral
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