Mineral Information and Data:

Artinite
Mg2CO3(OH)2 • 3H2O [CNMNC approved formula]

Named after the Italian mineralogist, Ettore Artini (1866-1928), mineralogist at the University of Milan.

IMA status : Valid species (Pre-IMA 1902) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
16b.03.01.01  
  (16b) Carbonates - Hydroxyl or Halogen
  (16b.03) where Am Bn (XO3)p Zq · x(H2O), (m+n):p = 2:1
  (16b.03.01)
  
Nickel-Strunz
(10th edition) :
05.DA.10
  (05) Carbonates and Nitrates
  (05.D) Carbonates with Additional Anions, with H2O
  (05.DA) With medium-sized cations
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
Unit cell: a = 16.56Å, b = 3.15Å, c = 6.22Å β = 99.15°
Crystal Habit: Typically acicular along [010], to 2.5 cm, forming cross-fiber veinlets, botyroidal crusts, and spherical or bow tie aggregates of divergent crystals.
  
Color: White; colorless in transmitted light.
Diaphaneity: Transparent
Luster: Vitreous, silky to satiny in aggregates.
Hardness (Mohs): 2.5
Measured Density: 2.02–2.03 g/cm3
Cleavage: {100}, perfect; {001}, good
Tenacity: Brittle
Streak: White
  
Geologic Setting: A low-temperature mineral in weathered or altered ultramafic rocks, typically serpentinites, likely occurring worldwide.
Mineral Association: Brucite, hydromagnesite, pyroaurite, chrysotile, aragonite, calcite, dolomite, magnesite
  

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