Mineral Information and Data:

Talmessite
Ca2Mg(AsO4)2 • 2H2O [CNMNC approved formula]

Named for the locality: Talmessi mine, 35 km west of Anarak, Iran. In the Arhbar (Aghbar) and A¨it Ahmane mines, Bou Azzer district, Morocco.

IMA status : Approved Species 1960 ()
CLASSIFICATION 
Dana
(8th edition) :
40.02.02.05  
  (40) Hydrated Phosphates
  (40.02) where A++ (B++)2 (XO4) · x(H2O)
  (40.02.02) Fairfieldite Subgroup (Triclinic: P1)
  
Nickel-Strunz
(10th edition) :
08.CG.05
  (08) Phosphates, Arsenates, Vanadates
  (08.C) Phosphates without Additional Anions, with H2O
  (08.CG) With large and medium-sized cations, RO4:H2O = 1:1
  
Crystal system: Triclinic System
Point group (H-M): 1 — pinacoidal
  
  
  

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