Mineral Information and Data:

Sturmanite
Ca6Fe3+2(SO4)2.5[B(OH)4](OH)12 • 25H2O [CNMNC approved formula]

Named for B. Darko Sturman (1937-), Canadian mineralogist, Royal Ontario Museum, Toronto, Canada.

IMA status : Approved Species 1983 ()
CLASSIFICATION 
Dana
(8th edition) :
32.04.04.02  
  (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: Tetragonal System
Point group (H-M): 4mm — ditetragonal-pyramidal
  
  
  
Other Properties: Gemstone Unlikely Available.

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