Mineral Information and Data:

Chestermanite
Mg2(Fe3+,Mg,Al,Sb5+)O2BO3 [CNMNC approved formula]

Named for Charles W. Chesterman (1913-1991), U. S. Geologist who discovered the mineral.

IMA status : Approved Species 1988 ()
CLASSIFICATION 
Dana
(8th edition) :
24.02.01.05  
  (24) Borates - Anhydrous
  (24.02) where (A)2 BO2 [XO3]
  (24.02.01) Ludwigite Group (Space Group: Pbam)
  
Nickel-Strunz
(10th edition) :
06.AB.40
  (06) Borates
  (06.A) Monoborates
  (06.AB) BO3, without additional anions; 1(D) + OH, etc.
  
Crystal system: Orthorhombic System
Point group (H-M): mmm (or 2/m 2/m 2/m) — dipyramidal
  
  
  

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