Mineral Information and Data:

Chiavennite
CaMn2+(BeOH)2Si5O13 • 2H2O [CNMNC approved formula]

Named for the locality: Tanno, Chiavenna, Lombardy, Italy.

IMA status : Approved Species 1983 ()
CLASSIFICATION 
Dana
(8th edition) :
70.05.01.01  
  (70) Inosilicate Column or Tube Structures
  (70.05) with chains linked by Be
  (70.05.01)
  
Nickel-Strunz
(10th edition) :
09.GF.25
  (09) Silicates
  (09.G) Tektosilicates with Zeolitic H2O
  (09.GF) Other Rare Zeolites
  
Crystal system: Orthorhombic System
Point group (H-M): mmm (or 2/m 2/m 2/m) — dipyramidal
  
  
  

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