Ohmilite Mineral Data

General Ohmilite Information

Chemical Formula:

Sr3(Ti,Fe+++)(Si2O6)2(O,OH)•2-3(H2O)

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

Empirical Formula:

Sr₃Ti_0.75Fe³⁺_0.25Si₄O_12.75(OH)_0.25•2.5(H₂O)

Environment:

In an amphibolite-quartz-albitite dike cutting serpentinite.

IMA Status:

Approved IMA 1973

Locality:

From Ohmi, Niigata Prefecture, Japan. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Ohmilite

Synonym:

ICSD 31213

PDF 26-1388

Ohmilite Image

Images:

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

Axial Ratios:

a:b:c =1.4077:1:1.0024

Cell Dimensions:

a = 10.979, b = 7.799, c = 7.818, Z = 2; beta = 100.9° V = 657.34 Den(Calc)= 3.43

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 4.62(1), 3.83(0.9), 3.26(0.85),

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

Color:

Light pink.

Density:

3.38

Hardness:

3.5 - Copper Penny

Streak:

white

Optical Properties of Ohmilite

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

Optical Data:

Biaxial (?), a=1.649, g=1.715, bire=0.0660

Calculated Properties of Ohmilite

Electron Density:

Bulk Density (Electron Density)=3.21 gm/cc
note: Specific Gravity of Ohmilite =3.38 gm/cc.

Fermion Index:

Fermion Index = 0.04
Boson Index = 0.96

Photoelectric:

PE_Ohmilite= 45.29 barns/electron
U=PE_Ohmilite x rElectron Density= 145.44 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Ohmilite is Not Radioactive

Ohmilite Classification

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

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

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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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Ask about Ohmilite here :
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Print or Cut-and-Paste your Ohmilite Specimen Label here :

Ohmilite

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

Notes: