Magbasite Mineral Data

General Information

Chemical Formula: KBa(Al,Sc)(Mg,Fe++)6Si6O20F2
IMA Status: Approved IMA 1965


Dana Class: 69.2.1c.1 (69)Chains with Side Branches or Loops (69.2)with P>2 (69.2.1c)Aenigmatite and related species (Magbasite subgroup)
Strunz Class: VIII/C.32-10 - Silicates [Sorosilicates with [Si3O10]8- groups (Magbasite series).]


Crystal System: Unknown
X Ray Diffraction: By Intensity(I/Io): 3.2(1) 3.63(1) 2.59(0.8)

Physical Properties

Color: colorless or pink violet.
Density: 3.41
Diaphaniety: Transparent
Hardness: 5 - Apatite
Luster: Vitreous (Glassy)
Streak: white

Optical Properties

Optical Data: Biaxial (-), a=1.597, b=1.609, g=1.615, bire=0.0180, 2V(Calc)=70, 2V(Meas)=70.

Other Information

References: PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
See Also: Athena Mineralogy
  Frederic Biret
  École des Mines de Paris

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