Sinhalite Mineral Data

Sinhalite Mineral Data +

General Sinhalite Information

Chemical Formula:

MgAlBO4

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

Empirical Formula:

MgAl(BO₄)

IMA Status:

Valid Species (Pre-IMA) 1952

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 75942

PDF 25-1379

Sinhalite Image

Images:

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

Axial Ratios:

a:b:c =0.4385:1:0.5751

Cell Dimensions:

a = 4.328, b = 9.868, c = 5.676, Z = 4; V = 242.41 Den(Calc)= 3.45

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/I_o): 2.14(1), 1.62(0.9), 3.24(0.7),

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

Color:

Brown, Brown pink, Colorless, Yellow, Light pink.

Density:

3.475 - 3.5, Average = 3.48

Diaphaniety:

Transparent

Hardness:

6.5-7 - Pyrite-Quartz

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Sinhalite

Gladstone-Dale:

CI meas= 0.028 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.017 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2034,KPDmeas= 0.2012,KC= 0.207

Optical Data:

Biaxial (?), b=1.6969, g=1.7065, , 2V(Meas)=56.

Calculated Properties of Sinhalite

Electron Density:

r_electron=3.39 gm/cc
note: r_Sinhalite=3.45 gm/cc.

Fermion Index

Fermion Index = 0.03657
Boson Index = 0.96343

Photoelectric:

PE_Sinhalite= 1.14 barns/electron
U=PE_Sinhalite x r_electron= 3.88 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Sinhalite is Not Radioactive

Sinhalite Classification

Dana Class:

24.1.1.1 (24)Borates - Anhydrous

(24.1)where (A)2 XO4

(24.1.1)Dana Group

24.1.1.1 Sinhalite MgAlBO4 Pbmm 2/m 2/m 2/m

Strunz Class:

V/G.07-10 V - Nitrates, Carbonates and Borates

V/G - "Insel" borates [BO4]5- tetraheders

V/G.07 - Sinhalite - Behierite series

V/G.07-10 Sinhalite MgAlBO4 Pbmm 2/m 2/m 2/m

V/G.07-12 Pseudosinhalite! Mg2Al3B2O9(OH) P 2₁/c 2/m

V/G.07-20 Behierite (Ta,Nb)BO4 I 4₁/amd 4/m 2/m 2/m

Other Sinhalite Information

References:

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 Sinhalite Specimen Label here :

Sinhalite

MgAlBO4
Dana No: 24.1.1.1 Strunz No: V/G.07-10
Locality:

Notes: