Mineral Information and Data:

Melanophlogite
C2H17O5 • Si46O92 [CNMNC approved formula]

Named From the Greek for "black" and "to be burned" in allusion to the fact that some specimens blacken on heating. Low temperature form.

IMA status : Approved Species 1876 ()
CLASSIFICATION 
Dana
(8th edition) :
75.02.02.01  
  (75) Tectosilicate Si Tetrahedral Frameworks
  (75.02) with H2O and organics
  (75.02.02) Melanophlogite Polymorphs
  
Nickel-Strunz
(10th edition) :
04.DA.25
  (04) Oxides and Hydroxides
  (04.D) Metal:Oxygen = 1:2 and similar
  (04.DA) With small cations: Silica family
  
Crystal system: Tetragonal System
Point group (H-M): 4/mmm (or 4/m 2/m 2/m) — ditetragonal-dipyramidal
  
  
  

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