Mineral Information and Data:

Ferric-ferronyboite
NaNa2(Fe2+3Fe3+2)(Si7Al)O22(OH)2 [CNMNC approved formula]

Named as per current IMA amphibole nomenclature (Burke and Leake 2004; Can. Mineral., 42, 1881-1883).

IMA status : Approved Species 1997 ()
CLASSIFICATION 
Dana
(8th edition) :
66.01.03c.11b  (This Dana# Added)
  (66) Inosilicate Double-Width Unbranched Chains, W=2
  (66.01) with P=2 amphibole configuration
  (66.01.03c) Group 4, the sodic amphiboles
  
Nickel-Strunz
(10th edition) :
09.DE.25
  (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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