Ohmilite Mineral Data + Say OHMILITE


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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 IMA Status: IMA Status: Approved IMA 1973
Help on Locality: Locality: Link to MinDat.org Location Data.
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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Help on Above


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
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:

relectron=3.21 gm/cc
note: rOhmilite =3.38 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.04231
Boson Index = 0.95769
Help on Photoelectric: Photoelectric:

PEOhmilite = 45.29 barns/electron
U=PEOhmilite x relectron= 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: 65.3.4.3 (65)Inosilicate Single-Width Unbranched Chains, W=1
  (65.3)with chains P=4
  (65.3.4)Batisite group
 
65.3.4.1 Batisite BaNaNaTi2O2[Si4O12] Ima2 mm2
 
65.3.4.2 Shcherbakovite KKNaTi2O(OH)[Si4O12] I mma 2/m 2/m 2/m
 
65.3.4.3 Ohmilite Sr3(Ti,Fe)(Si2O6)2(O,OH)·2-3(H2O) P 21/m 2/m
Help on  Strunz Class: Strunz Class: VIII/F.25-50 VIII - Silicates
  VIII/F - Inosilicates (chain and band) Quadruplet chains [Si4O12]8-
  VIII/F.25 - Batisite - Ohmilite series
 
VIII/F.25-10 Batisite BaNaNaTi2O2[Si4O12] Ima2 mm2
 
VIII/F.25-20 Shcherbakovite KKNaTi2O(OH)[Si4O12] I mma 2/m 2/m 2/m
 
VIII/F.25-30 Taikanite (Ba,Sr)2Mn2Si4O12 C 2 2
 
VIII/F.25-40 Krauskopfite BaSi2O4(OH)2·2(H2O) P 21/a 2/m
 
VIII/F.25-50 Ohmilite Sr3(Ti,Fe)(Si2O6)2(O,OH)·2-3(H2O) P 21/m 2/m
 

Other Ohmilite Information

Help on References: References: 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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (MinSocAm) 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - WWW-MINCRYST 14 -École des Mines de Paris

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Ohmilite

Sr3(Ti,Fe+++)(Si2O6)2(O,OH)·2-3(H2O)
Dana No: 65.3.4.3 Strunz No: VIII/F.25-50
Locality:

 

Notes:

 

 
   
 
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