Magbasite Mineral Data

General Information
Chemical Formula:	KBa(Al,Sc)(Mg,Fe++)6Si6O20F2
IMA Status:	Approved IMA 1965
Classification
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).]
Crystallography
Crystal System:	Unknown
X Ray Diffraction:	By Intensity(I/I_o): 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
	Google
	MinMax
	École des Mines de Paris