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Pseudosinhalite Mineral Data

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General Pseudosinhalite Information

Help on Chemical  Formula: Chemical Formula: Mg2Al3B2O9(OH)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Mg2Al3B2O9(OH)
Help on Environment: Environment: Associated with hydrotalcite and occurs at the Tayozhnoye Fe-B skarn as a toptactic, retrograde replacement of sinhalite in metasomatized marble.
Help on IMA Status: IMA Status: Approved IMA 1999 (Dana # Added)
Help on Locality: Locality: Aldan Shield, southern Sakha - Yakutia Republic, Russian Federation. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: The name alludes to the optical, chemical, and structural similarity to sinhalite.
Help on Name Pronunciation: Name Pronunciation: Pseudosinhalite + Pronunciation Say PSEUDOSINHALITE
Help on Synonym: Synonym: IMA1997-014

Pseudosinhalite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.7297:1:2.2748
Help on Cell Dimensions: Cell Dimensions: a = 7.49, b = 4.33, c = 9.85, Z = 2; beta = 110.7° V = 298.83 Den(Calc)= 3.47
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 1.625(1), 2.14(1), 2.102(0.6),

Physical Properties of Pseudosinhalite

Help on Cleavage: Cleavage: None
Help on Color: Color: Colorless.
Help on Density: Density: 3.608 - 3.508, Average = 3.55
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 Habit: Habit: Pseudomorphous - Occurs in the form of another mineral.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Pseudosinhalite

Help on Gladstone-Dale: 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
Ncalc = 1.73 - 1.76
Help on Optical Data: Optical Data: Biaxial (-), a=1.691, b=1.713, g=1.73, bire=0.0390

Calculated Properties of Pseudosinhalite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.42 gm/cc
note: Specific Gravity of Pseudosinhalite =3.47 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEPseudosinhalite = 1.18 barns/electron
U=PEPseudosinhalite x rElectron Density= 4.05 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Pseudosinhalite is Not Radioactive

Pseudosinhalite Classification

Help on  Dana Class: Dana Class: (25)Anhydrous Borates Containing Hydroxyl or Halogen
  (25.08)Dana Type
  (25.08.03)Dana Group Pseudosinhalite! Mg2Al3B2O9(OH) P 21/c 2/m
Help on  Strunz Class: Strunz Class: 06.AC.10 06 - BORATES
  06.A - Monoborates
  06.AC -B(O,OH)4, without and with additional anions; 1(T), 1(T)+OH, etc.
06.AC.10 Pseudosinhalite! Mg2Al3B2O9(OH) P 21/c 2/m

Other Pseudosinhalite Information

Help on References: References: NAME( AmMin, Vol 84, No. 7-8) PHYS. PROP.(AmMin, Vol 84, No. 7-8) OPTIC PROP.(MinRec)
Help on See Also: See Also: Links to other databases for Pseudosinhalite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Dana No: Strunz No: 06.AC.10





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