Mineral Information and Data:

Balangeroite
Mg21Si8O27(OH)20 [CNMNC approved formula]

Named after the locality: Balangero (San Vittore) mine, Piedmont, Italy.

IMA status : Approved Species 1983 (IMA1982-002)
CLASSIFICATION 
Dana
(8th edition) :
65.03.02.01  
  (65) Inosilicate Single-Width Unbranched Chains, W=1
  (65.03) with chains P=4
  (65.03.02) Gageite group
  
Nickel-Strunz
(10th edition) :
09.DH.35
  (09) Silicates
  (09.D) Inosilicates* Structural terminology per Liebau (1985)
  (09.DH) with 4-periodic single chains, Si4O12
  
Crystal system: Monoclinic System
Point group (H-M): 2/m — prismatic
Unit cell: a = 19.4Å, b = 9.65Å, c = 19.4Å; β = 91.1°
Crystal Habit: Fibrous, both loose and compact; asbestiform, elongated along [001], to several cm.
  
Color: Brown
Diaphaneity: Transparent only in thin section
Luster: Vitreous, greasy
Measured Density: 2.96{3.10 g/cm3
Cleavage: One or more on {hk0} are very good
Tenacity: Brittle
  
Geologic Setting: In schistose serpentinite in proximity to a large ultramafic massif.
Mineral Association: Chrysotile, magnetite, Fe-Ni alloy, olivine, chlorite, titanian clinohumite, diopside, antigorite, calcite, aragonite, "opal", "chalcedony", clay minerals.
  

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