Mineral Information and Data:

Chambersite
Mn3B7O13Cl [CNMNC approved formula]

Named for the locality: Barber's Hill salt dome, Chambers County, Texas, USA.

IMA status : Approved Species 1962 ()
CLASSIFICATION 
Dana
(8th edition) :
25.06.01.03  
  (25) Anhydrous Borates Containing Hydroxyl or Halogen
  (25.06)
  (25.06.01) Boracite Group (Orthorhombic: Rca21)
  
Nickel-Strunz
(10th edition) :
06.GA.05
  (06) Borates
  (06.G) Heptaborates and other Megaborates
  (06.GA) Tekto-heptaborates
  
Crystal system: Orthorhombic System
Point group (H-M): mm2 — pyramidal
  
  
  
Other Properties: Gemstone Extremely Rare.

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