Magbasite Mineral Data

Magbasite Mineral Data +

General Magbasite Information

Chemical Formula:

KBa(Al,Sc)(Mg,Fe++)6Si6O20F2

Composition:

Molecular Weight = 943.31 gm

Potassium 4.14 % K 4.99 % K₂O

Barium 14.56 % Ba 16.25 % BaO

Magnesium 10.31 % Mg 17.09 % MgO

Scandium 1.19 % Sc 1.83 % Sc₂O₃

Aluminum 2.15 % Al 4.05 % Al₂O₃

Iron 11.84 % Fe 15.23 % FeO

Silicon 17.86 % Si 38.22 % SiO₂

Oxygen 33.92 % O

Fluorine 4.03 % F 4.03 % F

- % F -1.70 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

KBaAl_0.75Sc_0.25Mg₄Fe²⁺₂Si₆O₂₀F₂

Environment:

Hydorthermal deposits.

IMA Status:

Approved IMA 1965

Locality:

Asian part of Russia. Link to MinDat.org Location Data.

Name Origin:

Named after its composition of Mg, Ba, and Si.

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Magbasite Crystallography

Axial Ratios:

a:b:c =1.1898:1:0.279

Cell Dimensions:

a = 22.56, b = 18.96, c = 5.29, Z = 6; V = 2,262.73 Den(Calc)= 4.15

Crystal System:

OrthorhombicSpace Group: P?

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.2(1), 3.63(1), 2.59(0.8),

Physical Properties of Magbasite

Color:

Colorless, Pink violet.

Density:

3.41

Diaphaniety:

Transparent

Habit:

Fibrous - Crystals made up of fibers.

Hardness:

5 - Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Magbasite

Gladstone-Dale:

CI meas= 0.053 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.222 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1463,KPDmeas= 0.178,KC= 0.1879

Optical Data:

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

Calculated Properties of Magbasite

Electron Density:

r_electron=3.27 gm/cc
note: r_Magbasite=3.41 gm/cc.

Fermion Index

Fermion Index = 0.04727
Boson Index = 0.95273

Photoelectric:

PE_Magbasite= 66.10 barns/electron
U=PE_Magbasite x r_electron= 216.02 barns/cc.

Radioactivity:

GRapi = 57.32 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Magbasite - barely detectable

Magbasite Classification

Dana Class:

69.2.1c.1 (69)Inosilicate Chains with Side Branches or Loops

(69.2)with P>2

(69.2.1c)Aenigmatite and related species (Magbasite subgroup)

69.2.1c.1 Magbasite KBa(Al,Sc)(Mg,Fe)6Si6O20F2 P? Ortho

Strunz Class:

VIII/C.32-10 VIII - Silicates

VIII/C - Sorosilicates with [Si3O10]8- groups

VIII/C.32 - Magbasite series

VIII/C.32-10 Magbasite KBa(Al,Sc)(Mg,Fe)6Si6O20F2 P? Ortho

Other Magbasite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Print or Cut-and-Paste your Magbasite Specimen Label here :

Magbasite

KBa(Al,Sc)(Mg,Fe++)6Si6O20F2
Dana No: 69.2.1c.1 Strunz No: VIII/C.32-10
Locality:

Notes: