Mineral Information and Data:

Okayamalite
Ca2B2SiO7 [CNMNC approved formula]

Named after it's locality: Fuka mine, Bicchu-cho, Okayama Prefecture, Japan.

IMA status : Approved Species 1998 ()
CLASSIFICATION 
Dana
(8th edition) :
55.04.01.04  (This Dana# Added)
  (55) Sorosilicate Si2O7 Groups, Generally with No Additional Anions
  (55.04) with cations in [8] and lower coordination
  (55.04.01) Melilite group
  
Nickel-Strunz
(10th edition) :
09.BB.10
  (09) Silicates
  (09.B) Sorosilicates (dimer) structures
  (09.BB) Si2O7 groups, without non-tetrahedral anions; cations in tetrahedral [4] and greater coordination
  
Crystal system: Tetragonal System
Point group (H-M): 42m (or 4 2m) — scalenohedral
  
  
  

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