Mineral Information and Data:

Tacharanite
Ca12Al2Si18O33(OH)36 [CNMNC approved formula]

Named from the Gaelic "tacharan," a changeling, because on standing in air the mineral breaks down to form other compounds (not noticed by later investigators).

IMA status : Approved Species 1961 ()
CLASSIFICATION 
Dana
(8th edition) :
72.03.02.06  
  (72) Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
  (72.03) with 3-, 4-, or 5-membered rings and 8-membered rings
  (72.03.02) Tobermorite group (5- & 8-membered rings)
  
Nickel-Strunz
(10th edition) :
09.HA.75
  (09) Silicates
  (09.H) Unclassified Silicates
  (09.HA) With Alkali and Alkali-earth Elements
  
Crystal system: Monoclinic System
Point group (H-M): Unknown — Unk
  
  
  

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