Mineral Information and Data:

Simpsonite
Al4Ta3O13(OH) [CNMNC approved formula]

Named for Edward Sydney Simpson (1875-1939), Western Australian government mineralogis and mineral analyst.

IMA status : Valid species (Pre-IMA 1938) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
08.07.05.01  
  (08) Multiple Oxides with Nb, Ta, and Ti
  (08.07)
  (08.07.05)
  
Nickel-Strunz
(10th edition) :
04.DC.10
  (04) Oxides and Hydroxides
  (04.D) Metal:Oxygen = 1:2 and similar
  (04.DC) With medium-sized cations; sheets of edge-sharing octahedra
  
Crystal system: Trigonal System
Point group (H-M): 3 — pyramidal
  
  
  
Other Properties: Gemstone Rare.

<<< BACK TO MINERAL SEARCH