Mineral Information and Data:

Preobrazhenskite
Mg3B11O15(OH)9 [CNMNC approved formula]

Named for Pavel Ivanovich Preobrazhenskii (1874-1944), investigator of Russian salt deposits, Institute of Halurgy, St. Petersburg.

IMA status : Valid species (Pre-IMA 1956) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
25.07.01.01  
  (25) Anhydrous Borates Containing Hydroxyl or Halogen
  (25.07)
  (25.07.01)
  
Nickel-Strunz
(10th edition) :
06.GB.15
  (06) Borates
  (06.G) Heptaborates and other Megaborates
  (06.GB) Phyllo-nonborates, etc.
  
Crystal system: Orthorhombic System
Point group (H-M): mmm (or 2/m 2/m 2/m) — dipyramidal
  
  
  
Other Properties: Gemstone Extremely Rare.

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