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.

Name Pronunciation:

Magbasite + Pronunciation

Search for Magbasite Images

Images:

Image not yet available on Webmineral.com

Try searching images.google.com or Mindat Picture Gallary for mineral pictures. Caution: The images retrieved may not be appropriate.

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

Diaphaneity:

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
Ncalc = 1.64 - 1.78

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:

Bulk Density (Electron Density)=3.27 gm/cc
note: Specific Gravity of Magbasite =3.41 gm/cc.

Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

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)
Concentration of Magbasite per GRapi unit = 1.74 (%)

Estimated Radioactivity from Magbasite - barely detectable

Magbasite Classification

Dana Class:

69.02.01c.01 (69)Inosilicate Chains with Side Branches or Loops

(69.02)with P>2

(69.02.01c)Aenigmatite and related species (Magbasite subgroup)

69.02.01c.01 Magbasite KBa(Al,Sc)(Mg,Fe)6Si6O20F2 P? Ortho

Strunz Class:

09.HA.25 09 - SILICATES (Germanates)

09.H - Unclassified Silicates

09.HA -With alkali and alkali-earth Elements

09.HA.25 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)

See Also:

Links to other databases for Magbasite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

Search for Magbasite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Magbasite :

A Bijoux Google Search for Magbasite
Adam's Minerals Google Search for Magbasite
Cape Minerals Google Search for Magbasite
Dakota Matrix Minerals Google Search for Magbasite
Excalibur Mineral Corp. Google Search for Magbasite
Exceptional Minerals Google Search for Magbasite
John Betts Fine Minerals Search for Magbasite
McDougall Minerals Google Search for Magbasite
Mineral News Website Link
Rock and Mineral Shows Google Search for Magbasite
Weinrich Minerals, Inc. Google Search for Magbasite

Ask about Magbasite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Magbasite

KBa(Al,Sc)(Mg,Fe++)6Si6O20F2
Dana No: 69.02.01c.01 Strunz No: 09.HA.25
Locality:

Notes: