Ohmilite Mineral Data

Ohmilite Mineral Data
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General Ohmilite Information

Help on Chemical Formula: Chemical Formula: Sr3(Ti,Fe+++)(Si2O6)2(O,OH)•2-3(H2O)
Help on Composition: Composition: Molecular Weight = 678.36 gm
   Strontium  38.75 %  Sr   45.83 % SrO
   Titanium    5.29 %  Ti    8.83 % TiO2
   Iron        2.06 %  Fe    2.94 % Fe2O3
   Silicon    16.56 %  Si   35.43 % SiO2
   Hydrogen    0.78 %  H     6.97 % H2O
   Oxygen     36.56 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Sr3Ti0.75Fe3+0.25Si4O12.75(OH)0.25•2.5(H2O)
Help on Environment: Environment: In an amphibolite-quartz-albitite dike cutting serpentinite.
Help on IMA Status: IMA Status: Approved IMA 1973
Help on Locality: Locality: From Ohmi, Niigata Prefecture, Japan. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Ohmilite Say OHMILITE
Help on Synonym: Synonym: ICSD 31213
  PDF 26-1388
 

Ohmilite Image

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Ohmilite

Comments: Pale yellow translucent acicular ohmilite crystal cluster in matrix.
Location: Hashidate, Ohmi cho, Niigata, Japan. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Ohmilite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =1.4077:1:1.0024
Help on Cell Dimensions: Cell Dimensions: a = 10.979, b = 7.799, c = 7.818, Z = 2; beta = 100.9° V = 657.34 Den(Calc)= 3.43
Help on Crystal System: Crystal System: Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.62(1), 3.83(0.9), 3.26(0.85),
Click Here for Large Ohmilite Structure Window Crystal Structure:

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Mizota T , Komatsu M , Chihara K , American Mineralogist , 68 (1983) p.811-817, A refinement of the crystal structure of ohmilite, Sr3(Ti,Fe3+)(O,OH)(Si2O6)2*, 2-3H2O

 

Physical Properties of Ohmilite

Help on Color: Color: Light pink.
Help on Density: Density: 3.38
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Streak: Streak: white
 

Optical Properties of Ohmilite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.029 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.043 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1988,KPDmeas= 0.2018,KC= 0.2078
Ncalc = 1.7 - 1.71
Help on Optical Data: Optical Data: Biaxial (?), a=1.649, g=1.715, bire=0.0660
 

Calculated Properties of Ohmilite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.21 gm/cc
note: Specific Gravity of Ohmilite =3.38 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
Help on Photoelectric: Photoelectric: PEOhmilite = 45.29 barns/electron
U=PEOhmilite x rElectron Density= 145.44 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Ohmilite is Not Radioactive
 

Ohmilite Classification
Help on Dana Class: Dana Class: 65.03.04.03 (65)Inosilicate Single-Width Unbranched Chains, W=1
  (65.03)with chains P=4
  (65.03.04)Batisite group
 
65.03.04.01 Batisite BaNaNaTi2O2[Si4O12] Ima2 mm2
 
65.03.04.02 Shcherbakovite KKNaTi2O(OH)[Si4O12] I mma 2/m 2/m 2/m
 
65.03.04.03 Ohmilite Sr3(Ti,Fe)(Si2O6)2(O,OH)•2-3(H2O) P 21/m 2/m
Help on Strunz Class: Strunz Class: 09.DH.10 09 - SILICATES (Germanates)
  09.D - Inosilicates* Structural terminology according to Liebau (1985)
  09.DH -Inosilicates with 4-periodic single chains, Si4O12
 
09.DH.10 Ohmilite Sr3(Ti,Fe)(Si2O6)2(O,OH)•2-3(H2O) P 21/m 2/m
 

Other Ohmilite Information
Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Ohmilite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Ohmilite

Sr3(Ti,Fe+++)(Si2O6)2(O,OH)•2-3(H2O)
Dana No: 65.03.04.03 Strunz No: 09.DH.10
Locality:

 

Notes: