Mineral Information and Data:

Derbylite
Fe3+4Ti4+3Sb3+O13(OH) [CNMNC approved formula]

Named after the American Geologist Orville A. Derby 1851 - 1915 founder of the Brazilian Geological Survey.

IMA status : Valid species (Pre-IMA 1897) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
46.02.03.02  
  (46) Basic or Halogen-Containing Antimonites, Arsenites and Phosphites
  (46.02) with miscellaneous formulae
  (46.02.03) Derbylite Group
  
Nickel-Strunz
(10th edition) :
04.JB.55
  (04) Oxides and Hydroxides
  (04.J) Arsenites, Antimonites, Bismuthites, Sulfites,
  (04.JB) Arsenites, antimonites, bismuthites; with additional anions, without H2O
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
  
  
  

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