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Itoigawaite Mineral Data

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General Itoigawaite Information

Help on Chemical  Formula: Chemical Formula: SrAl2Si2O7(OH)2•(H2O)
Help on Composition: Composition: Molecular Weight = 361.78 gm
   Strontium  24.22 %  Sr   28.64 % SrO
   Aluminum   14.92 %  Al   28.18 % Al2O3
   Silicon    15.53 %  Si   33.22 % SiO2
   Hydrogen    1.11 %  H     9.96 % H2O
   Oxygen     44.22 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: SrAl2Si2O7(OH)2•(H2O)
Help on Environment: Environment: As a veinlet in jadeitite boulders. A member of the lawsonite group
Help on IMA Status: IMA Status: Approved IMA 1998 (Dana # Added)
Help on Locality: Locality: On the seashore of Oyashirazu, about 15 km WSW of Itoigawa Station, Itoigawa-Ohmi district, Niigata-ken Prefecture, Japan. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Synonym: Synonym: IMA1998-034
 

Itoigawaite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.6742:1:1.4778
Help on Cell Dimensions: Cell Dimensions: a = 6.031, b = 8.945, c = 13.219, Z = 4; V = 713.13 Den(Calc)= 3.37
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: C mcm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.68(1), 3.31(0.85), 4.26(0.85),2.45(0.75), 2.5(0.75), 2.63(0.75), 2.75(0.75), 4.68(0.75),
 

Physical Properties of Itoigawaite

Help on Cleavage: Cleavage: {???} Good
Help on Color: Color: Blue.
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 5-5.5 - Apatite-Knife Blade
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Itoigawaite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= 0.012 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2004,KC= 0.2028
Ncalc = 1.68
Help on Optical Data: Optical Data: Biaxial (+), a=1.664, b=1.674, g=1.688, bire=0.0240
 

Calculated Properties of Itoigawaite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.28 gm/cc
note: Specific Gravity of Itoigawaite =3.37 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEItoigawaite = 27.38 barns/electron
U=PEItoigawaite x rElectron Density= 89.78 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Itoigawaite is Not Radioactive
 

Itoigawaite Classification

Help on  Dana Class: Dana Class: 56.02.03.05 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O
  (56.02)with cations in [4] and/or >[4] coordination
  (56.02.03)Lawsonite - Ilvaite group
 
56.02.03.01 Lawsonite CaAl2Si2O7(OH)2•(H2O) Ccmm 2/m 2/m 2/m
 
56.02.03.02 Hennomartinite SrMn2Si2O7(OH)2•(H2O) C mcm 2/m 2/m 2/m
 
56.02.03.03 Ilvaite CaFe2FeSi2O7O(OH) Pbnm 2/m 2/m 2/m
 
56.02.03.04 Noelbensonite! BaMn2(Si2O7)(OH)2•(H2O) C mcm 2/m 2/m 2/m
 
56.02.03.05 Itoigawaite! SrAl2Si2O7(OH)2•(H2O) C mcm 2/m 2/m 2/m
 
56.02.03.06 Manganilvaite! CaFeFe(Mn,Fe)(Si2O7)O(OH) P 21/a 2/m
Help on  Strunz Class: Strunz Class: 09.BE.05 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BE -Si2O7 groups with additional anions;
 
09.BE.05 Hennomartinite SrMn2Si2O7(OH)2•(H2O) C mcm 2/m 2/m 2/m
 
09.BE.05 Lawsonite CaAl2Si2O7(OH)2•(H2O) Ccmm 2/m 2/m 2/m
 
09.BE.05 Noelbensonite! BaMn2(Si2O7)(OH)2•(H2O) C mcm 2/m 2/m 2/m
 
09.BE.05 Itoigawaite! SrAl2Si2O7(OH)2•(H2O) C mcm 2/m 2/m 2/m
 

Other Itoigawaite Information

Help on References: References: NAME( MinRec, Vol 31, No 4) PHYS. PROP.(MinRec, Vol 31, No 4) OPTIC PROP.(MinRec, Vol 31, No 4)
Help on See Also: See Also: Links to other databases for Itoigawaite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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

Itoigawaite

SrAl2Si2O7(OH)2•(H2O)
Dana No: 56.02.03.05 Strunz No: 09.BE.05
Locality:

 

Notes:

 

 
   
 


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