Boralsilite Mineral Data

Boralsilite Mineral Data
Search Webmineral :
   
Home Crystal jmol jPOWD Chem X Ray Dana Strunz Properties A to Z Images       News Help About



[Newest Minerals] [Mineral Auctions] [Mineral Gallery]
The Mineral Gallery's Exceptional Specimens and Mineral Hall of Fame
Visa, PayPal, and Mastercard are Welcomed


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
  IMA1996-029
  PDF 51-1451
 

Boralsilite Image

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

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 - PrismaticH-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),
Click Here for Large Boralsilite Structure Window Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
 Help on Above


Peacor D R , Rouse R C , Grew E S , American Mineralogist , 84 (1999) p.1152-1161, The crystal structure of boralsilite and its relation to a family of, boroaluminosilicates, sillimanite, and andalusite

 

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: 56.03.03.01 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O
  (56.03)with [Si2O7] with borate groups
  (56.03.03)Dana Group
 
56.03.03.01 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 - Google Images
4 - Google Scholar
5 - MinDAT
6 - MinMax(Deutsch)
7 - MinMax(English)
8 - Mineralienatlas (Deutsch)
9 - QUT Mineral Atlas
10 - Ruff.Info

Search for Boralsilite using:

Google
 
Web webmineral.com
[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Boralsilite :

AA Mineral Specimens

B & L Fine Minerals

Crystalarium.com

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

Dakota Matrix

Desert Winds Gems and Minerals

Excalibur Minerals

Exceptional Minerals

Fabre Minerals

Heliodor

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

Wrights Rock Shop

Translate Boralsilite Mineral Data :

Ask about Boralsilite 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 Espaņol

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

Boralsilite

Al16B6Si2O27
Dana No: 56.03.03.01 Strunz No: 09.BD.30
Locality:

 

Notes: