Mineral Information and Data:

Charlesite
Ca6Al2(SO4)2B(OH)4(OH,O)12 • 26H2O [CNMNC approved formula]

Named for Charles Palache (1869-1954), professor of mineralogy, Harvard University.

IMA status : Approved Species 1983 ()
CLASSIFICATION 
Dana
(8th edition) :
32.04.04.01  
  (32) Compound Sulfates
  (32.04) (hydrous) with poly-anionic formula
  (32.04.04) Charlesite Group
  
Nickel-Strunz
(10th edition) :
07.DG.15
  (07) Sulfates (selenates, tellurates, chromates, molybdates, wolframates)
  (07.D) Sulfates (selenates, etc.) with additional anions, with H2O
  (07.DG) With large and medium-sized cations; with NO3, CO3, B(OH)4, SiO4 or IO3
  
Crystal system: Trigonal System
Point group (H-M): 3m — ditrigonal-pyramidal
  
  
  
Other Properties: Gemstone Extremely Rare.

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