Mineralogy Database

Boralsilite Mineral Data

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General Boralsilite Information

Help on Chemical  Formula: Chemical Formula: Al16B6Si2O27
Help on Composition: Composition: Molecular Weight = 1,144.71 gm
   Aluminum  37.71 %  Al   71.26 % Al2O3
   Silicon    4.91 %  Si   10.50 % SiO2
   Boron      5.67 %  B    18.25 % B2O3
   Oxygen    51.71 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Al16B6Si2O37
Help on Environment: Environment: Found in a tourmaline - quartz intergrowth in granitic pegmatite cutting granulite-facies metapelitic rocks, Structurally related to sillimanite.
Help on IMA Status: IMA Status: Approved IMA 1998 (Dana # Added)
Help on Locality: Locality: Stornes Peninsula, Larsemann Hills, Prydz Bay, east Antarctica. Almgjotheii in the aureole of the Rogaland intrusive complex, southwestern Norway. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after its composition of (bor}on, (al)uminum, and (sil)icon.
Help on Name Pronunciation: Name Pronunciation: Boralsilite + Pronunciation Say BORALSILITE
Help on Synonym: Synonym: ICSD 87662
  PDF 51-1451

Boralsilite Image

Click Here for Larger   Image in a New Browser Window Images:
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  Boralsilite   Grandidierite

Comments: B&W PPL image of aggregates of boralsilite in quartz near grandidierite. Pyrite is partially replaced by oxide. Abbrev: A+B = Secondary andalusite, B = boralsilite, G = grandidierite, P = pyrite, Q = quartz. (AmMin v93:294).
Location: Pegmatites from the Larsemann Hills, East Antarctica. Scale: See Image.
© American Mineralogist

Boralsilite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =2.6492:1:2.7052
Help on Cell Dimensions: Cell Dimensions: a = 14.767, b = 5.574, c = 15.079, Z = 2; beta = 91.96° V = 1,240.45 Den(Calc)= 3.06
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 5.19(1), 4.31(0.7), 5.41(0.7),

Physical Properties of Boralsilite

Help on Cleavage: Cleavage: {???} Fair, {???} Fair
Help on Color: Color: White, Colorless.
Help on Density: Density: 3.06
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Boralsilite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.004 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.004 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2095,KPDmeas= 0.2095,KC= 0.2086
Ncalc = 1.64
Help on Optical Data: Optical Data: Biaxial (+), a=1.629, b=1.64, g=1.654, bire=0.0250, 2V(Calc)=84, 2V(Meas)=81.8. Dispersion very weak, r > v.

Calculated Properties of Boralsilite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.00 gm/cc
note: Specific Gravity of Boralsilite =3.06 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEBoralsilite = 1.35 barns/electron
U=PEBoralsilite x rElectron Density= 4.06 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Boralsilite is Not Radioactive

Boralsilite Classification

Help on  Dana Class: Dana Class: (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O
  (56.03)with [Si2O7] with borate groups
  (56.03.03)Dana Group Boralsilite! Al16B6Si2O27 C 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.BD.30 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BD -Si2O7 groups with additional anions;
09.BD.30 Boralsilite! Al16B6Si2O27 C 2/m 2/m

Other Boralsilite Information

Help on References: References: NAME( MinRec) PHYS. PROP.(Am.Min.,Vol?83,p638-651,1998) OPTIC PROP.(MinRec)
Help on See Also: See Also: Links to other databases for Boralsilite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Dana No: Strunz No: 09.BD.30





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