Sinhalite Mineral Data

Sinhalite Mineral Data
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General Sinhalite Information

Help on Chemical Formula: Chemical Formula: MgAlBO4
Help on Composition: Composition: Molecular Weight = 126.09 gm
   Magnesium  19.28 %  Mg   31.96 % MgO
   Aluminum   21.40 %  Al   40.43 % Al2O3
   Boron       8.57 %  B    27.61 % B2O3
   Oxygen     50.75 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: MgAl(BO4)
Help on Environment: Environment: Accessory mineral formed in boron-rich skarns at the contact of limestones with granite or gneiss.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1952
Help on Locality: Locality: Gem gravels in the Ratnapura district. Sri Lanka. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Sinhala, the Sanskrit name for Ceylon.
Help on Name Pronunciation: Name Pronunciation: Sinhalite + Pronunciation Say SINHALITE
Help on Synonym: Synonym: ICSD 75942
  PDF 25-1379
 

Sinhalite Image

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Sinhalite

Comments: Crystalline sinhalite in white marble.
Location: Amity, near Warwick, Orange County, New York, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Sinhalite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.4385:1:0.5751
Help on Cell Dimensions: Cell Dimensions: a = 4.328, b = 9.868, c = 5.676, Z = 4; V = 242.41 Den(Calc)= 3.45
Help on Crystal System: Crystal System: Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pbmm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.14(1), 1.62(0.9), 3.24(0.7),
Click Here for Large Sinhalite Structure Window Crystal Structure:

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Hayward C L , Angel R J , Ross N L , European Journal of Mineralogy , 6 (1994) p.313-321, The structural redetermination and crystal chemistry, of sinhalite, MgAlBO4

 

Physical Properties of Sinhalite

Help on Color: Color: Brown, Brown pink, Colorless, Yellow, Light pink.
Help on Density: Density: 3.47 - 3.5, Average = 3.48
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Hardness: Hardness: 6.5-7 - Pyrite-Quartz
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Sinhalite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.039 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.029 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.201,KPDmeas= 0.199,KC= 0.207
Ncalc = 1.71 - 1.72
Help on Optical Data: Optical Data: Biaxial (-), a=1.667-1.676, b=1.697-1.704, g=1.705-1.712, bire=0.0360-0.0380, 2V(Calc)=52-54, 2V(Meas)=55.
Help on Pleochroism (x): Pleochroism (x): brown or pale yellow.
Help on Pleochroism (y): Pleochroism (y): green or pale brown.
Help on Pleochroism (z): Pleochroism (z): paler brown, pale greenish brown, or pale pinkish gray.
 

Calculated Properties of Sinhalite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.39 gm/cc
note: Specific Gravity of Sinhalite =3.45 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PESinhalite = 1.14 barns/electron
U=PESinhalite x rElectron Density= 3.88 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Sinhalite is Not Radioactive
 

Sinhalite Classification
Help on Dana Class: Dana Class: 24.01.01.01 (24)Borates - Anhydrous
  (24.01)where (A)2 XO4
  (24.01.01)Dana Group
 
24.01.01.01 Sinhalite MgAlBO4 Pbmm 2/m 2/m 2/m
Help on Strunz Class: Strunz Class: 06.AC.05 06 - BORATES
  06.A - Monoborates
  06.AC -B(O,OH)4, without and with additional anions; 1(T), 1(T)+OH, etc.
 
06.AC.05 Sinhalite MgAlBO4 Pbmm 2/m 2/m 2/m
 

Other Sinhalite Information
Help on References: References: NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic5)
Help on See Also: See Also: Links to other databases for Sinhalite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - Tradeshop.com - The Rainbow of Gems
17 - WWW-MINCRYST

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Ask about Sinhalite 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 Sinhalite Specimen Label here :

Sinhalite

MgAlBO4
Dana No: 24.01.01.01 Strunz No: 06.AC.05
Locality:

 

Notes: