Mineral Information and Data:

Aluminotaramite
Na2CaFe2+3Al2(Si6Al2)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 2006 (IMA2006-023)
CLASSIFICATION 
Dana
(8th edition) :
66.01.03b.15a  (This Dana# Added)
  (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
Unit cell: a = 9.92 Å, b = 18.13 Å, c = 5.35 Å, b = 104.84°
Crystal Habit: prismatic crystals, as grains and rims on other amphiboles
  
Color: Black, with possible tinges of blue or green
Diaphaneity: Semi-transparent
Luster: Vitreous
Hardness (Mohs): 5 - 6
Measured Density: 3.23 - 3.48 g/cm3
Cleavage: 3; {110} perfect, {100} and {001} parting
Tenacity: Brittle
  
Geologic Setting: Found in sodium-metasomatised alkalic gneisses and nepheline syenite dikes; in eclogite metamorphosed to the amphibolite facies.
  

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