Mineral Information and Data:

Stillwellite-(Ce)
CeBSiO5 [CNMNC approved formula]

Named for Frank Leslie Stillwell (1888-1963), Australian ore mineralogist and the dominant Ce content.

IMA status : Approved Species 1955 ()
CLASSIFICATION 
Dana
(8th edition) :
54.02.03.02  
  (54) Nesosilicate Borosilicates and Some Beryllosilicates
  (54.02) with B in [4] coordination
  (54.02.03) Cappellanite - Stillwellite group
  
Nickel-Strunz
(10th edition) :
09.AJ.25
  (09) Silicates
  (09.A) Nesosilicates (Isolated tetrahedron) structures
  (09.AJ) Nesosilicates with BO3 triangles and/or B[4], Be[4] tetrahedra, cornersharing with SiO4
  
Crystal system: Trigonal System
Point group (H-M): 3 — pyramidal
  
  
  
Other Properties: Gemstone Extremely Rare.

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