Mineral Information and Data:

Ferrowinchite
[]NaCa[Fe2+4(Al,Fe3+)]Si8O22(OH)2 [CNMNC approved formula]

Named for its composition and for Howard J. Winch, Geological survey of India.

IMA status : Approved Species 1978 ()
CLASSIFICATION 
Dana
(8th edition) :
66.01.03b.02  
  (66) Inosilicate Double-Width Unbranched Chains, W=2
  (66.01) with P=2 amphibole configuration
  (66.01.03b) Group 3, the sodic-calcic amphiboles
  
Nickel-Strunz
(10th edition) :
09.DE.20
  (09) Silicates
  (09.D) Inosilicates* Structural terminology per Liebau (1985)
  (09.DE) with 2-periodic double chains, Si4O11; Clinoamphiboles
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
  
  
  

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