Mineral Information and Data:

Benstonite
Ba6Ca6Mg(CO3)13 [CNMNC approved formula]

Named for Orlando J. Benston (1901-1966), metallurgist for the Baroid Division, National Lead Co., Malvern, Arkansas, USA, who supplied the first specimens.

IMA status : Approved Species 1961 ()
CLASSIFICATION 
Dana
(8th edition) :
14.02.03.01  
  (14) Anhydrous Carbonates
  (14.02) with Compound Formula A+ B++ (CO3)2
  (14.02.03)
  
Nickel-Strunz
(10th edition) :
05.AB.55
  (05) Carbonates and Nitrates
  (05.A) Carbonates without additional anions, without H2O
  (05.AB) Alkali-earth (and other M2+) carbonates
  
Crystal system: Trigonal System
Point group (H-M): 3 — pyramidal
  
  
  

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