Ohmilite
A valid IMA mineral species
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About Ohmilite
Formula:
Sr3(Ti,Fe3+)(Si4O12)(O,OH) · 2-3H2O
Colour:
Pink to pinkish brown
Hardness:
3½
Specific Gravity:
3.38
Crystal System:
Monoclinic
Name:
Named in 1973 by Masayuki Komatsu, Kazuya Chihara, and Tadato Mizota after the type locality of Ohmi, Niigata Prefecture, Central Japan.
Type Locality:
Unique Identifiers
Mindat ID:
2963
Long-form identifier:
mindat:1:1:2963:2
GUID
(UUID V4):
(UUID V4):
6d4fdf3c-4f7f-43af-b372-545d50286c47
IMA Classification of Ohmilite
Approved
IMA Formula:
Sr3(Ti,Fe3+)(Si2O6)2(O,OH) · 2H2O
Approval year:
1974
First published:
1973
Classification of Ohmilite
9.DH.10
9 : SILICATES (Germanates)
D : Inosilicates
H : Inosilicates with 4-periodic single chains, Si4O12
9 : SILICATES (Germanates)
D : Inosilicates
H : Inosilicates with 4-periodic single chains, Si4O12
65.3.4.3
65 : INOSILICATES Single-Width,Unbranched Chains,(W=1)
3 : Single-Width Unbranched Chains, W=1 with chains P=4
65 : INOSILICATES Single-Width,Unbranched Chains,(W=1)
3 : Single-Width Unbranched Chains, W=1 with chains P=4
14.9.7
14 : Silicates not Containing Aluminum
9 : Silicates of Ti
14 : Silicates not Containing Aluminum
9 : Silicates of Ti
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Oh | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Ohmilite
Transparency:
Translucent
Colour:
Pink to pinkish brown
Streak:
White
Hardness:
3½ on Mohs scale
Cleavage:
Perfect
Parallel to (100)
Parallel to (100)
Density:
3.38 g/cm3 (Measured) 3.394 g/cm3 (Calculated)
Optical Data of Ohmilite
Type:
Biaxial
RI values:
nα = 1.649 nγ = 1.715
Max Birefringence:
δ = 0.066
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r < v strong
Pleochroism:
Weak
Comments:
Very weak, colourless to light pink.
Chemistry of Ohmilite
Mindat Formula:
Sr3(Ti,Fe3+)(Si4O12)(O,OH) · 2-3H2O
Crystallography of Ohmilite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Setting:
P21/m
Cell Parameters:
a = 10.97 Å, b = 7.79 Å, c = 7.81 Å
β = 100.9°
β = 100.9°
Ratio:
a:b:c = 1.408 : 1 : 1.003
Unit Cell V:
655.37 ų (Calculated from Unit Cell)
Z:
2
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0000908 | Ohmilite | Mizota T, Komatsu M, Chihara K (1983) A refinement of the crystal structure of ohmilite, Sr3(Ti,Fe3+)(O,OH)(Si2O6)2* 2-3H2O American Mineralogist 68 811-817 | 1983 | 0 | 293 | ||
0014415 | Ohmilite | Mizota T, Komatsu M, Chihara K (1973) On the crystal structure of Sr3TiSi4O12(OH)*2H2O, a new mineral Mineralogical Journal 7 302-305 | 1973 | Ohmi District, Niigata Prefecture, Central Japan | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
10.83 Å | (70) |
5.39 Å | (77) |
4.62 Å | (100) |
3.83 Å | (90) |
3.471 Å | (42) |
3.409 Å | (40) |
3.264 Å | (85) |
3.037 Å | (80) |
2.831 Å | (54) |
2.730 Å | (57) |
2.600 Å | (90) |
2.564 Å | (40) |
2.400 Å | (42) |
2.101 Å | (42) |
2.076 Å | (42) |
2.028 Å | (42) |
Comments:
Ōmi, Niigata Prefecture, Japan. The data are from Komatsu et al. (1973).
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 4b: Highly evolved igneous rocks | >3.0 |
34 : Complex granite pegmatites |
Type Occurrence of Ohmilite
General Appearance of Type Material:
Aggregates of very fine-grained crystals or occasionally spherulitic aggregates of radially arranged crystals in interstitial parts of albite aggregates. To 0.2 mm.
Place of Conservation of Type Material:
Niigata University, Niigata, Japan (type).
Geological Setting of Type Material:
In an amphibole-quartz-albitite dike cutting serpentinite.
Associated Minerals at Type Locality:
Reference:
Mizota, T., Komatsu, M., Chihara, K. (1973) On the crystal structure of Sr3TiSi4O12(OH).2H2O, a new mineral. Mineralogical Journal Japan: 7(3): 302-305.
Synonyms of Ohmilite
Other Language Names for Ohmilite
Common Associates
Associated Minerals Based on Photo Data:
1 photo of Ohmilite associated with Magnesio-riebeckite | ◻{Na2}{Mg3Fe3+2}(Si8O22)(OH)2 |
1 photo of Ohmilite associated with Albite | Na(AlSi3O8) |
Related Minerals - Strunz-mindat Grouping
9.DH. | Gageite-2M | (Mn,Mg,Zn)42Si16O54(OH)40 |
9.DH. | Bavsiite | Ba2V2O2[Si4O12] |
9.DH. | Devilliersite | Ca4Ca2Fe3+10O4[(Fe3+10Si2)O36] |
9.DH. | Yuzuxiangite | Sr3Fe3+(Si2O6)2(OH) · 3H2O |
9.DH. | Louisfuchsite | Ca2(Mg4Ti2)(Al4Si2)O20 |
9.DH.05 | Leucophanite | NaCaBeSi2O6F |
9.DH.15 | Haradaite | SrVSi2O7 |
9.DH.15 | Suzukiite | BaVSi2O7 |
9.DH.20 | Batisite | BaNaNaTi2(Si4O12)O2 |
9.DH.20 | Shcherbakovite | (K,Ba)KNa(Ti,Nb)2(Si4O12)O2 |
9.DH.20 | Noonkanbahite | BaKNaTi2(Si4O12)O2 |
9.DH.25 | Taikanite | Sr3BaMn2+2(Si4O12)O2 |
9.DH.30 | Krauskopfite | BaSi2O5 · 3H2O |
9.DH.35 | Balangeroite | (Mg,Fe2+,Fe3+,Mn2+)42Si16O54(OH)40 |
9.DH.35 | Gageite | Mn21(Si4O12)2O3(OH)20 |
9.DH.40 | Aenigmatite | Na4[Fe2+10Ti2]O4[Si12O36] |
9.DH.40 | Dorrite | Ca4(Mg3Fe3+9)O4(Si3Al8Fe3+O36) |
9.DH.40 | Høgtuvaite | Ca4[Fe2+6Fe3+6]O4[Si8Be2Al2O36] |
9.DH.40 | Krinovite | Na2Mg4Cr3+2(Si6O18)O2 |
9.DH.40 | Makarochkinite | (Ca,Na)4[Fe2+8Fe3+2Ti2]O4[Si8Be2Al2O36] |
9.DH.40 | Rhönite | Ca4[Mg8Fe3+2Ti2]O4[Si6Al6O36] |
9.DH.40 | Serendibite | Ca4[Mg6Al6]O4[Si6B3Al3O36] |
9.DH.40 | Welshite | Ca4Mg9Sb3O4[Si6Be3AlFe2O36] |
9.DH.40 | Wilkinsonite | Na2Fe2+4Fe3+2(Si6O18)O2 |
9.DH.40 | Leucorhönite | Ca2(Mg,Fe3+,Al)6(Si,Al)6O20 |
9.DH.40 | Kuratite | Ca2(Fe2+5Ti)O2[Si4Al2O18] |
9.DH.40 | Khesinite | Ca4(Mg3Fe3+9)O4(Fe3+9Si3)O36 |
9.DH.40 | UM1991-29-SiO:FeMgNa | Na4(Mg5Fe3+7)O4[Si9Fe3+3O36] |
9.DH.45 | Sapphirine | Mg4(Mg3Al9)O4[Si3Al9O36] |
9.DH.50 | Khmaralite | (Mg,Al,Fe)16[(Al,Si,Be)12O36]O4 |
9.DH.55 | Surinamite | (Mg,Fe)3Al4BeSi3O16 |
9.DH.55 | UM1988-26-SiO:AlMg | Mg4Al2O[Si3Al2O15] |
9.DH.60 | Deerite | (Fe,Mn)6(Fe,Al)3[Si6O17]O3(OH)5 |
9.DH.65 | Howieite | Na(Fe,Mn)10(Fe,Al)2Si12O31(OH)13 |
9.DH.65 | Taneyamalite | (Na,Ca)(Mn,Mg,Fe)12Si12(O,OH)44 |
9.DH.70 | Johninnesite | Na2Mn2+9Mg7(OH)8[AsO4]2[Si6O17]2 |
9.DH.75 | Agrellite | NaCa2Si4O10F |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Ohmilite
mindat.org URL:
https://www.mindat.org/min-2963.html
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References for Ohmilite
Reference List:
Mizota, Tadato, Komatsu, Masayuki, Chihara, Kazuya (1973) On the crystal structure of Sr3TiSi4O12(OH)·2H2O, a new mineral. Mineralogical Journal, 7 (3) 302-305 doi:10.2465/minerj1953.7.302
Komatsu, Masayuki, Chihara, Kazuya, Mizota, Tadato (1973) A new strontium-titanium hydrous silicate mineral from Ohmi, Niigata Prefecture, central Japan. Mineralogical Journal, 7 (3) 298-301 doi:10.2465/minerj1953.7.298
Mizota, Tadato, Komatsu, Masayuki, Chihara, Kazuya (1973) On the crystal structure of Sr3TiSi4O12(OH)·2H2O, a new mineral. Mineralogical Journal, 7 (3) 302-305 doi:10.2465/minerj1953.7.302
Localities for Ohmilite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Japan | |
| ... +1 other reference |
Komatsu et al. (1973) | |
| Hiroaki Tano specimen +1 other reference |
Hiroaki Tano's collection |
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Ōmi, Itoigawa City, Niigata Prefecture, Japan