Mineral Information and Data:

Asbecasite
Ca3TiAs6Be2Si2O20 [CNMNC approved formula]

Named its main element components: As,Be,Ca, and Si.

IMA status : Approved Species 1966 (IMA1965-037)
CLASSIFICATION 
Dana
(8th edition) :
45.01.03.01  
  (45) Acid and normal Antimonites, Arsenites and Phosphites
  (45.01) with miscellaneous formulae
  (45.01.03)
  
Nickel-Strunz
(10th edition) :
04.JB.30
  (04) Oxides and Hydroxides
  (04.J) Arsenites, Antimonites, Bismuthites, Sulfites,
  (04.JB) Arsenites, antimonites, bismuthites; with additional anions, without H2O
  
Crystal system: Trigonal System
Point group (H-M): 3m — ditrigonal-pyramidal
Unit cell: a = 8.364Å, c = 15.304Å
Crystal Habit: As rhombohedral crystals, up to 5 mm, fattened on {0001}, with {0112}.
  
Color: Lemon-yellow or citron-yellow
Diaphaneity: Transparent
Luster: Vitreous
Hardness (Mohs): 6.5 - 7
Measured Density: 3.70 g/cm3
  
Geologic Setting: On cleft faces in orthogneiss (Cherbadung, Switzerland).
Mineral Association: Magnetite, hematite, titanite, apatite, anatase, malachite, azurite, tennantite, molybdenite (Cherbadung, Switzerland)
  

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