Mineral Information and Data:

Ferri-clinoferroholmquistite
[]Li2(Fe2+3Fe3+2)Si8O22(OH)2 [CNMNC approved formula]

Named as ferrous/ferric-end member of the clinoholmquistite series. Species named for Johan Holmquist (1866-1946), petrologist, Stockhom, Sweden. Named per nomenclature of amphiboles (IMA, 1997).

IMA status : Approved Species 2003 (IMA2001-066)
CLASSIFICATION 
Dana
(8th edition) :
66.01.01.08b  (This Dana# Added)
  (66) Inosilicate Double-Width Unbranched Chains, W=2
  (66.01) with P=2 amphibole configuration
  (66.01.01) Group 1, the Mg-Fe-Mn-Li amphiboles (Monoclinic)
  
Nickel-Strunz
(10th edition) :
09.DE.05
  (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
  
  
  
Comments: Mineral discovered in nature:
Oberti R, Cámara F, Caballero J M, Ottolini L (2003) Sodic-ferri-ferropedrizite and ferri-clinoferroholmquistite: mineral data and degree of order of the Α-site cations in Li-rich amphiboles, The Canadian Mineralogist 41, 1345-1354

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