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Ohmilite

A valid IMA mineral species

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Photos of Ohmilite (10)

Ohmilite Gallery Search Photos of Ohmilite

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Ohmilite

Ōmi, Itoigawa City, Niigata Prefecture, Japan

Ohmilite

Ōmi, Itoigawa City, Niigata Prefecture, Japan

Ohmilite

Ōmi, Itoigawa City, Niigata Prefecture, Japan

Ohmilite

Ōmi, Itoigawa City, Niigata Prefecture, Japan

Ohmilite

Ōmi, Itoigawa City, Niigata Prefecture, Japan

Ohmilite

Ōmi, Itoigawa City, Niigata Prefecture, Japan

Ohmilite

Ōmi, Itoigawa City, Niigata Prefecture, Japan

Ohmilite

Ōmi, Itoigawa City, Niigata Prefecture, Japan

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About OhmiliteHide

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:

ⓘ Ōmi, Itoigawa City, Niigata Prefecture, Japan

The Ti- (or rather Ti-O)-analogue of yuzuxiangite.

Unique IdentifiersHide

Mindat ID:

2963

Long-form identifier:

mindat:1:1:2963:2

GUID
(UUID V4):

6d4fdf3c-4f7f-43af-b372-545d50286c47

IMA Classification of OhmiliteHide

IMA status:

Approved

IMA Formula:

Sr₃(Ti,Fe³⁺)(Si₂O₆)₂(O,OH) · 2H₂O

Approval year:

1974

First published:

1973

Type description reference:

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

Classification of OhmiliteHide

Strunz-mindat (2024):

9.DH.10

9 : SILICATES (Germanates)
D : Inosilicates
H : Inosilicates with 4-periodic single chains, Si₄O₁₂

Dana 8th ed.:

65.3.4.3

65 : INOSILICATES Single-Width,Unbranched Chains,(W=1)
3 : Single-Width Unbranched Chains, W=1 with chains P=4

Hey's CIM Ref.:

14.9.7

14 : Silicates not Containing Aluminum
9 : Silicates of Ti

Mineral SymbolsHide

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 OhmiliteHide

Transparency:

Translucent

Colour:

Pink to pinkish brown

Streak:

White

Hardness:

3½ on Mohs scale

Cleavage:

Perfect
Parallel to (100)

Density:

3.38 g/cm³ (Measured) 3.394 g/cm³ (Calculated)

Optical Data of OhmiliteHide

Type:

Biaxial

RI values:

n_α = 1.649 n_γ = 1.715

Max Birefringence:

δ = 0.066

Image shows birefringence interference colour range (at 30µm thickness)
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 OhmiliteHide

Mindat Formula:

Sr₃(Ti,Fe³⁺)(Si₄O₁₂)(O,OH) · 2-3H₂O

Elements listed:

Fe, H, O, Si, Sr, Ti - search for minerals with similar chemistry

Crystallography of OhmiliteHide

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°

Ratio:

a:b:c = 1.408 : 1 : 1.003

Unit Cell V:

655.37 Å³ (Calculated from Unit Cell)

Crystal StructureHide

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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

data_global
_chemical_name_mineral 'Ohmilite'
loop_
_publ_author_name
'Mizota T'
'Komatsu M'
'Chihara K'
_journal_name_full 'American Mineralogist'
_journal_volume 68 
_journal_year 1983
_journal_page_first 811
_journal_page_last 817
_publ_section_title
;
 A refinement of the crystal structure of ohmilite, Sr3(Ti,Fe3+)(O,OH)(Si2O6)2*
 2-3H2O
;
_database_code_amcsd 0000908
_chemical_formula_sum 'Sr3 Ti Si4 O15.274 H4.548'
_cell_length_a 10.979
_cell_length_b 7.799
_cell_length_c 7.818
_cell_angle_alpha 90
_cell_angle_beta 100.9
_cell_angle_gamma 90
_cell_volume 657.341
_exptl_crystal_density_diffrn      3.395
_symmetry_space_group_name_H-M 'P 1 21/m 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  'x,1/2-y,z'
  '-x,1/2+y,-z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
Sr1   0.11070   0.25000   0.35230   1.00000
Sr2   0.41640   0.25000   0.71750   1.00000
Sr3   0.26670   0.75000   0.39160   1.00000
Ti   0.00000   0.00000   0.00000   1.00000
Si1   0.29890   0.45320   0.11600   1.00000
Si2   0.20540   0.54700   0.74180   1.00000
O1   0.02780   0.25000   0.00330   1.00000
O2   0.16690   0.52890   0.14860   1.00000
O3   0.06650   0.52670   0.77620   1.00000
O4   0.29720   0.25000   0.16910   1.00000
O5   0.24170   0.75000   0.73440   1.00000
O6   0.41080   0.54460   0.24100   1.00000
O7   0.23370   0.45720   0.56980   1.00000
O8   0.30390   0.46100   0.90700   1.00000
Wat1   0.02830   0.75000   0.40960   1.00000
Wat2   0.50770   0.25000   0.43230   1.00000
Wat3   0.52100   0.25000   0.02900   0.27400
loop_
_atom_site_aniso_label
_atom_site_aniso_U_11
_atom_site_aniso_U_22
_atom_site_aniso_U_33
_atom_site_aniso_U_12
_atom_site_aniso_U_13
_atom_site_aniso_U_23
Sr1 0.01119 0.00740 0.00776 0.00000 0.00294 0.00000
Sr2 0.00883 0.00647 0.01254 0.00000 0.00419 0.00000
Sr3 0.01119 0.00555 0.00866 0.00000 0.00419 0.00000
Ti 0.00824 0.05423 0.00567 0.00596 0.00168 -0.00516
Si1 0.00883 0.00462 0.00717 0.00000 0.00168 -0.00030
Si2 0.01060 0.00339 0.00717 0.00000 0.00419 0.00000
O1 0.01354 0.00986 0.01224 0.00000 0.00545 0.00000
O2 0.01060 0.00709 0.01015 0.00000 0.00126 -0.00243
O3 0.01178 0.00740 0.00926 -0.00085 0.00419 0.00030
O4 0.01825 0.00401 0.00955 0.00000 0.00377 0.00000
O5 0.02238 0.00154 0.01403 0.00000 0.01048 0.00000
O6 0.01472 0.00801 0.01284 -0.00213 0.00084 -0.00334
O7 0.01766 0.00462 0.00985 0.00043 0.00461 -0.00243
O8 0.01178 0.00894 0.00985 0.00256 0.00503 0.00212
Wat1 0.01001 0.01140 0.01224 0.00000 -0.00042 0.00000
Wat2 0.01766 0.01664 0.01373 0.00000 0.00252 0.00000
Wat3 0.06477 0.01541 0.38814 0.00000 0.13837 0.00000

X-Ray Powder DiffractionHide

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 EnvironmentHide

Paragenetic Mode(s):

Paragenetic Mode	Earliest Age (Ga)
Stage 4b: Highly evolved igneous rocks	>3.0
34 : Complex granite pegmatites

Type Occurrence of OhmiliteHide

Type Locality:

ⓘ Ōmi, Itoigawa City, Niigata Prefecture, Japan

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 OhmiliteHide

IMA1974-031

Other Language Names for OhmiliteHide

German:Ohmilit

Japanese:青海石

Russian:Омилит

Spanish:Ohmilita

Common AssociatesHide

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 Hide

9.DH.	Gageite-2M	(Mn,Mg,Zn)₄₂Si₁₆O₅₄(OH)₄₀	Mon. 2/m
9.DH.	Bavsiite	Ba₂V₂O₂[Si₄O₁₂]	Tet. 4/m : I4/m
9.DH.	Devilliersite	Ca₄Ca₂Fe³⁺₁₀O₄[(Fe³⁺₁₀Si₂)O₃₆]	Tric. 1 : P1
9.DH.	Yuzuxiangite	Sr₃Fe³⁺(Si₂O₆)₂(OH) · 3H₂O	Mon. 2/m : P2₁/m
9.DH.	Louisfuchsite	Ca₂(Mg₄Ti₂)(Al₄Si₂)O₂₀	Tric. 1 : P1
9.DH.05	Leucophanite	NaCaBeSi₂O₆F	Orth. 2 2 2 : P2₁ 2₁ 2₁
9.DH.15	Haradaite	SrVSi₂O₇	Orth. mmm (2/m 2/m 2/m)
9.DH.15	Suzukiite	BaVSi₂O₇	Orth.
9.DH.20	Batisite	BaNaNaTi₂(Si₄O₁₂)O₂	Orth. mmm (2/m 2/m 2/m) : Imma
9.DH.20	Shcherbakovite	(K,Ba)KNa(Ti,Nb)₂(Si₄O₁₂)O₂	Orth. mmm (2/m 2/m 2/m) : Imma
9.DH.20	Noonkanbahite	BaKNaTi₂(Si₄O₁₂)O₂	Orth. mmm (2/m 2/m 2/m) : Imma
9.DH.25	Taikanite	Sr₃BaMn²⁺₂(Si₄O₁₂)O₂	Mon. 2 : B2
9.DH.30	Krauskopfite	BaSi₂O₅ · 3H₂O	Mon. 2/m : P2₁/b
9.DH.35	Balangeroite	(Mg,Fe²⁺,Fe³⁺,Mn²⁺)₄₂Si₁₆O₅₄(OH)₄₀	Mon. 2/m
9.DH.35	Gageite	Mn₂₁(Si₄O₁₂)₂O₃(OH)₂₀	Mon. 2/m
9.DH.40	Aenigmatite	Na₄[Fe²⁺₁₀Ti₂]O₄[Si₁₂O₃₆]	Tric. 1 : P1
9.DH.40	Dorrite	Ca₄(Mg₃Fe³⁺₉)O₄(Si₃Al₈Fe³⁺O₃₆)	Tric.
9.DH.40	Høgtuvaite	Ca₄[Fe²⁺₆Fe³⁺₆]O₄[Si₈Be₂Al₂O₃₆]	Tric. 1 : P1
9.DH.40	Krinovite	Na₂Mg₄Cr³⁺₂(Si₆O₁₈)O₂	Tric. 1 : P1
9.DH.40	Makarochkinite	(Ca,Na)₄[Fe²⁺₈Fe³⁺₂Ti₂]O₄[Si₈Be₂Al₂O₃₆]	Tric. 1 : P1
9.DH.40	Rhönite	Ca₄[Mg₈Fe³⁺₂Ti₂]O₄[Si₆Al₆O₃₆]	Tric. 1 : P1
9.DH.40	Serendibite	Ca₄[Mg₆Al₆]O₄[Si₆B₃Al₃O₃₆]	Tric. 1 : P1
9.DH.40	Welshite	Ca₄Mg₉Sb₃O₄[Si₆Be₃AlFe₂O₃₆]	Tric. 1 : P1
9.DH.40	Wilkinsonite	Na₂Fe²⁺₄Fe³⁺₂(Si₆O₁₈)O₂	Tric. 1 : P1
9.DH.40	Leucorhönite	Ca₂(Mg,Fe³⁺,Al)₆(Si,Al)₆O₂₀	Tric.
9.DH.40	Kuratite	Ca₂(Fe²⁺₅Ti)O₂[Si₄Al₂O₁₈]	Tric. 1 : P1
9.DH.40	Khesinite	Ca₄(Mg₃Fe³⁺₉)O₄(Fe³⁺₉Si₃)O₃₆	Tric. 1 : P1
9.DH.40	UM1991-29-SiO:FeMgNa	Na₄(Mg₅Fe³⁺₇)O₄[Si₉Fe³⁺₃O₃₆]
9.DH.45	Sapphirine	Mg₄(Mg₃Al₉)O₄[Si₃Al₉O₃₆]	Mon. 2/m : P2₁/b
9.DH.50	Khmaralite	(Mg,Al,Fe)₁₆[(Al,Si,Be)₁₂O₃₆]O₄	Mon. 2/m : P2₁/b
9.DH.55	Surinamite	(Mg,Fe)₃Al₄BeSi₃O₁₆	Mon. 2/m
9.DH.55	UM1988-26-SiO:AlMg	Mg₄Al₂O[Si₃Al₂O₁₅]
9.DH.60	Deerite	(Fe,Mn)₆(Fe,Al)₃[Si₆O₁₇]O₃(OH)₅	Mon. 2/m : P2₁/b
9.DH.65	Howieite	Na(Fe,Mn)₁₀(Fe,Al)₂Si₁₂O₃₁(OH)₁₃	Tric.
9.DH.65	Taneyamalite	(Na,Ca)(Mn,Mg,Fe)₁₂Si₁₂(O,OH)₄₄	Tric.
9.DH.70	Johninnesite	Na₂Mn²⁺₉Mg₇(OH)₈[AsO₄]₂[Si₆O₁₇]₂	Tric.
9.DH.75	Agrellite	NaCa₂Si₄O₁₀F	Tric. 1 : P1

Other InformationHide

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 OhmiliteHide

mindat.org URL:

https://www.mindat.org/min-2963.html
Please feel free to link to this page.

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External Links:

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Raman and XRD data at RRUFF project

References and PDF downloads at RRUFF project

American Mineralogist Crystal Structure Database

Handbook of Mineralogy page PDF

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References for OhmiliteHide

Reference List:

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 (1983) A refinement of the crystal structure of ohmilite, Sr₃(Ti,Fe²⁺)(O,OH)(Si₂O₆)₂·2-3H₂O. American Mineralogist, 68 (7-8) 811-817

(2023) Ohmilite. Handbook of Mineralogy. Mineralogical Society of America

Localities for OhmiliteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the

symbol to view information about a locality. The

symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- 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.


Japan
Niigata Prefecture ⓘ Itoigawa City	... +1 other reference
ⓘ Ōmi (TL)	Komatsu et al. (1973)
Hashidate ⓘ Kinzandani	Hiroaki Tano specimen +1 other reference
ⓘ Ohmi river (Ohmi-gawa)	Hiroaki Tano's collection

Ohmilite

About OhmiliteHide

Unique IdentifiersHide

IMA Classification of OhmiliteHide

Classification of OhmiliteHide

Mineral SymbolsHide

Physical Properties of OhmiliteHide

Optical Data of OhmiliteHide

Chemistry of OhmiliteHide

Crystallography of OhmiliteHide

Crystal StructureHide

X-Ray Powder DiffractionHide

Geological EnvironmentHide

Type Occurrence of OhmiliteHide

Synonyms of OhmiliteHide

Other Language Names for OhmiliteHide

Common AssociatesHide

Related Minerals - Strunz-mindat GroupingHide

Other InformationHide

Internet Links for OhmiliteHide

References for OhmiliteHide

Localities for OhmiliteHide

Locality ListHide

Related Minerals - Strunz-mindat Grouping Hide