Pseudosinhalite Mineral Data + 
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- 25.8.3.1 Pseudosinhalite ! Mg2Al3B2O9(OH) P 21/c 2/m
- 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
General Pseudosinhalite Information |
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 Chemical Formula: |
Mg2Al3B2O9(OH) | ||
| Composition: |
Molecular Weight = 312.18 gm | ||
| Magnesium 15.57 % Mg 25.82 % MgO | |||
| Aluminum 25.93 % Al 48.99 % Al2O3 | |||
| Boron 6.93 % B 22.30 % B2O3 | |||
| Hydrogen 0.32 % H 2.89 % H2O | |||
| Oxygen 51.25 % O | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
| Empirical Formula: |
Mg2Al3B2O9(OH) | ||
| Environment: |
Associated with hydrotalcite and occurs at the Tayozhnoye Fe-B skarn as a toptactic, retrograde replacement of sinhalite in metasomatized marble. | ||
| IMA Status: |
Approved IMA 1999 (Dana # Added) | ||
| Locality: |
Aldan Shield, southern Sakha - Yakutia Republic, Russian Federation. Link to MinDat.org Location Data. | ||
| Name Origin: |
The name alludes to the optical, chemical, and structural similarity to sinhalite. | ||
| Synonym: |
IMA1997-014 | ||
Search for Pseudosinhalite Images | |||
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Images:
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Pseudosinhalite Crystallography |
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| Axial Ratios: |
a:b:c =1.7297:1:2.2748 | ||
| Cell Dimensions: |
a = 7.49, b = 4.33, c = 9.85, Z = 2; beta = 110.7° V = 298.83 Den(Calc)= 3.47 | ||
| Crystal System: |
Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/c | ||
| X Ray Diffraction: |
By Intensity(I/Io): 1.625(1), 2.14(1), 2.102(0.6), | ||
Physical Properties of Pseudosinhalite |
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| Cleavage: |
None | ||
| Color: |
Colorless. | ||
| Density: |
3.608 - 3.508, Average = 3.55 | ||
| Diaphaniety: |
Transparent | ||
| Fracture: |
Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz). | ||
| Habit: |
Pseudomorphous - Occurs in the form of another mineral. | ||
| Luster: |
Vitreous (Glassy) | ||
| Streak: |
white | ||
Optical Properties of Pseudosinhalite |
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| Gladstone-Dale: |
CI meas= 0.052 (Good) - where the CI = (1-KPDmeas/KC) CI calc= 0.028 (Excellent) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.205,KPDmeas= 0.1999,KC= 0.2108 |
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| Optical Data: |
Biaxial (-), a=1.691, b=1.713, g=1.73, bire=0.0390 | ||
Calculated Properties of Pseudosinhalite |
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| Electron Density: |
relectron=3.42 gm/cc |
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| Fermion Index |
Fermion Index = 0.02959 Boson Index = 0.97041 |
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| Photoelectric: |
PEPseudosinhalite = 1.18 barns/electron |
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Pseudosinhalite is Not Radioactive |
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Pseudosinhalite Classification |
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| Dana Class: |
25.8.3.1 (25)Anhydrous Borates Containing Hydroxyl or Halogen | ||
| (25.8)Dana Type | |||
| (25.8.3)Dana Group | |||
| Strunz Class: |
V/G.07-12 V - Nitrates, Carbonates and Borates | ||
| V/G - "Insel" borates [BO4]5- tetraheders | |||
| V/G.07 - Sinhalite - Behierite series | |||
Other Pseudosinhalite Information |
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| References: |
NAME( AmMin, Vol 84, No. 7-8) PHYS. PROP.(AmMin, Vol 84, No. 7-8) OPTIC PROP.(MinRec) | ||
| See Also: |
Links to other databases for Pseudosinhalite : 1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 - WWW-MINCRYST Search for Pseudosinhalite using: Visit our Advertisers for Pseudosinhalite : Translate Pseudosinhalite Mineral Data : Ask about Pseudosinhalite here : Print or Cut-and-Paste your Pseudosinhalite Specimen Label here :
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