| Itoigawaite Mineral Data |
General Itoigawaite Information |
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| SrAl2Si2O7(OH)2·(H2O) | |||
| 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 | |||
| SrAl2Si2O7(OH)2·(H2O) | |||
| As a veinlet in jadeitite boulders. A member of the lawsonite group | |||
| Approved IMA 1998 (Dana # Added) | |||
| 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. | |||
| Named for the locality. | |||
| IMA1998-034 | |||
Search for Itoigawaite Images | |||
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Itoigawaite Crystallography |
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| a:b:c =0.6742:1:1.4778 | |||
| a = 6.031, b = 8.945, c = 13.219, Z = 4; V = 713.13 Den(Calc)= 3.37 | |||
| Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: C mcm | |||
| 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 |
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| [???] Good | |||
| Blue. | |||
| Transparent | |||
| Microscopic Crystals - Crystals visible only with microscopes. | |||
| Tabular - Form dimensions are thin in one direction. | |||
| 5-5.5 - Apatite-Knife Blade | |||
| Vitreous (Glassy) | |||
| white | |||
Optical Properties of Itoigawaite |
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| CI calc= 0.012 (Superior) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2004,KC= 0.2028 |
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| Biaxial (+), a=1.664, b=1.674, g=1.688, bire=0.0240 | |||
Calculated Properties of Itoigawaite |
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relectron=3.28 gm/cc |
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| Fermion Index = 0.02441 Boson Index = 0.97559 |
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PEItoigawaite = 27.38 barns/electron |
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| GRapi = 0 (Gamma Ray American Petroleum Institute Units) Itoigawaite is Not Radioactive |
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Itoigawaite Classification |
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| 56.2.3.5 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O | |||
| (56.2)with cations in [4] and/or >[4] coordination | |||
| (56.2.3)Lawsonite - Ilvaite group | |||
| VIII/C.10-12 VIII - Silicates | |||
| VIII/C - Sorosilicates with [Si2O7]6-, with anions unfamiliar to tetraheders [O,OH,F] | |||
| VIII/C.10 - Lawsonite - Ilvaite series | |||
Other Itoigawaite Information |
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| NAME( MinRec, Vol 31, No 4) PHYS. PROP.(MinRec, Vol 31, No 4) OPTIC PROP.(MinRec, Vol 31, No 4) | |||
| Links to other databases for Itoigawaite : 1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas Search for Itoigawaite using: Visit our Advertisers for Itoigawaite : Translate Itoigawaite Mineral Data : Ask about Itoigawaite here : Print or Cut-and-Paste your Itoigawaite Specimen Label here :
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