Mineral Information and Data:

Batisite
Na2BaTi2(Si4O12)O2 [CNMNC approved formula]

Named for Ba, Ti, Si in the composition.

IMA status : Approved Species 1960 ()
CLASSIFICATION 
Dana
(8th edition) :
65.03.04.01  
  (65) Inosilicate Single-Width Unbranched Chains, W=1
  (65.03) with chains P=4
  (65.03.04) Batisite group
  
Nickel-Strunz
(10th edition) :
09.DH.20
  (09) Silicates
  (09.D) Inosilicates* Structural terminology per Liebau (1985)
  (09.DH) with 4-periodic single chains, Si4O12
  
Crystal system: Orthorhombic System
Point group (H-M): mm2 — pyramidal
Space group: Ima2
Unit cell: a = 10.43Å, b = 13.88Å, c = 8.08Å
Crystal Habit: As complex elongated crystals, to 10 cm.
  
Color: Dark brown
Diaphaneity: Transparent in thin slivers
Luster: Vitreous to slightly oily
Hardness (Mohs): ~6
Measured Density: 3.432 g/cm3
Cleavage: Fair on {100}, {010}, and {001}; parting on {110}.
Tenacity: Brittle
Streak: Rose-brown
  
Geologic Setting: In aegirine-arfvedsonite-microcline pegmatites in dunites (Inagli massif, Russia).
Mineral Association: Microcline, nepheline, aegirine, arfvedsonite, lorenzenite, uranian thorite, eudialyte, apatite, orthoclase (Inagli massif, Russia)
  
Other Properties: Piezoelectric.
Comments: Some specimens are piezoelectric.

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