Okhotskite-(Mn++) Mineral Data

General Okhotskite-(Mn++) Information

Chemical Formula:

Ca2(Mn++,Mg)(Mn+++,Al,Fe+++)Si3O10(OH)4

Composition:

Molecular Weight = 530.54 gm

Calcium 14.35 % Ca 20.08 % CaO

Magnesium 1.37 % Mg 2.28 % MgO

Manganese 18.64 % Mn 9.36 % MnO / 16.37 % Mn₂O₃

Aluminum 2.54 % Al 4.80 % Al₂O₃

Iron 4.21 % Fe 6.02 % Fe₂O₃

Silicon 15.88 % Si 33.98 % SiO₂

Hydrogen 0.78 % H 6.96 % H₂O

Oxygen 42.22 % O

______ ______

100.00 % 99.85 % = TOTAL OXIDE

Empirical Formula:

Ca_1.9Mn²⁺_0.7Mg_0.3Mn³⁺_1.1Al_0.5Fe³⁺_0.4Si₃O_9.9(OH)_4.1

Environment:

In network veinlets cutting hematite-rich ores.

IMA Status:

Approved IMA 1987

Locality:

From the Kokuriki mine, at Hiyoshi, about 20 km north of Kitami City, Hikkaido, Japan. Link to MinDat.org Location Data.

Name Origin:

Named in 1987 by Togari and Akasaka for the Sea of Okhotsk, along which the mine is located.

Name Pronunciation:

Okhotskite-(Mn++) + Pronunciation

Okhotskite-(Mn++) Crystallography

Axial Ratios:

a:b:c =1.4811:1:3.255

Cell Dimensions:

a = 8.887, b = 6, c = 19.53, Z = 4; beta = 97.08° V = 1,033.44 Den(Calc)= 3.41

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: A2/m

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

By Intensity(I/I_o): 2.961(1), 2.72(0.7), 3.87(0.7),

Physical Properties of Okhotskite-(Mn++)

Cleavage:

{???} Distinct

Color:

Orange.

Diaphaneity:

Transparent

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

6 - Orthoclase

Luster:

Vitreous (Glassy)

Streak:

pale orange

Optical Properties of Okhotskite-(Mn++)

Gladstone-Dale:

CI calc= 0.001 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2374,KC= 0.2377
Ncalc = 1.81

Optical Data:

Biaxial (-), a=1.782, b=1.82, g=1.827, bire=0.0450

Calculated Properties of Okhotskite-(Mn++)

Electron Density:

Bulk Density (Electron Density)=3.36 gm/cc
note: Specific Gravity of Okhotskite-(Mn++) =3.41 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_{Okhotskite-(Mn++)}= 8.44 barns/electron
U=PE_{Okhotskite-(Mn++)} x rElectron Density= 28.38 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Okhotskite-(Mn++) is Not Radioactive

Okhotskite-(Mn++) Classification

Dana Class:

58.02.02.04 (58)Sorosilicate Insular, Mixed, Single, and Larger Tetrahedral Groups

(58.02)with cations in [6] and higher coordination; single and double groups (n=1,2)

(58.02.02)Pumpellyite group

58.02.02.01 Julgoldite-(Fe++) Ca2Fe(Fe,Al)2(SiO4)(Si2O7)(OH)2•(H2O) C 2/m 2/m

58.02.02.02 Julgoldite-(Fe+++) Ca2Fe(Fe,Al)2(SiO4)(Si2O7)(O,OH)2•(H2O) A2/m 2/m

58.02.02.03 Okhotskite-(Mg)* Ca3(Mg,Mn)(Mn,Al,Fe)(SiO4)(Si2O7)(OH)2•(H2O) Mono

58.02.02.04 Okhotskite-(Mn++) Ca2(Mn,Mg)(Mn,Al,Fe)Si3O10(OH)4 A2/m 2/m

58.02.02.05 Pumpellyite-(Fe++) Ca2Fe(Al,Fe)2(SiO4)(Si2O7)(OH)2•(H2O) A2/m 2/m

58.02.02.06 Pumpellyite-(Fe+++) Ca2FeAl2(SiO4)(Si2O7)(OH,O)2•(H2O) A2/m 2/m

58.02.02.07 Pumpellyite-(Mg) Ca2MgAl2(SiO4)(Si2O7)(OH)2•(H2O) A2/m 2/m

58.02.02.08 Pumpellyite-(Mn++) Ca2(Mn,Mg)(Al,Mn,Fe)2(SiO4)(Si2O7(OH)2•(H2O) A2/m 2/m

58.02.02.09 Shuiskite Ca2(Mg,Al)(Cr,Al)2(SiO4)(Si2O7)(OH)2•(H2O) A2/m 2/m

58.02.02.10 Poppiite! Ca2(V,Fe,Mg)(V,Al)2(Si,Al)3(O,OH)14 C 2/m 2/m

58.02.02.11 Pumpellyite-(Al)! Ca2(Al,Fe,Mg)Al2(SiO4)(Si2O7)(OH,O)2•H2O A2/m 2/m

Strunz Class:

09.BG.20 09 - SILICATES (Germanates)

09.B - Sorosilicates

09.BG -Sorosilicates with mixed SiO4 and Si2O7 groups;

09.BG.20 Julgoldite-(Fe++) Ca2Fe(Fe,Al)2(SiO4)(Si2O7)(OH)2•(H2O) C 2/m 2/m

09.BG.20 Julgoldite-(Fe+++) Ca2Fe(Fe,Al)2(SiO4)(Si2O7)(O,OH)2•(H2O) A2/m 2/m

09.BG.20 Pumpellyite-(Fe++) Ca2Fe(Al,Fe)2(SiO4)(Si2O7)(OH)2•(H2O) A2/m 2/m

09.BG.20 Okhotskite-(Mg)* Ca3(Mg,Mn)(Mn,Al,Fe)(SiO4)(Si2O7)(OH)2•(H2O) Mono

09.BG.20 Okhotskite-(Mn++) Ca2(Mn,Mg)(Mn,Al,Fe)Si3O10(OH)4 A2/m 2/m

09.BG.20 Pumpellyite-(Fe+++) Ca2FeAl2(SiO4)(Si2O7)(OH,O)2•(H2O) A2/m 2/m

09.BG.20 Pumpellyite-(Mg) Ca2MgAl2(SiO4)(Si2O7)(OH)2•(H2O) A2/m 2/m

09.BG.20 Pumpellyite-(Mn++) Ca2(Mn,Mg)(Al,Mn,Fe)2(SiO4)(Si2O7(OH)2•(H2O) A2/m 2/m

09.BG.20 Shuiskite Ca2(Mg,Al)(Cr,Al)2(SiO4)(Si2O7)(OH)2•(H2O) A2/m 2/m

09.BG.20 Pumpellyite-(Al)! Ca2(Al,Fe,Mg)Al2(SiO4)(Si2O7)(OH,O)2•H2O A2/m 2/m

09.BG.20 Poppiite! Ca2(V,Fe,Mg)(V,Al)2(Si,Al)3(O,OH)14 C 2/m 2/m

Other Okhotskite-(Mn++) Information

References:

NAME( Dana8) PHYS. PROP.(AntBidBlaNic2) OPTIC PROP.(AntBidBlaNic2)

See Also:

Links to other databases for Okhotskite-(Mn++) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Okhotskite-(Mn++)

Ca2(Mn++,Mg)(Mn+++,Al,Fe+++)Si3O10(OH)4
Dana No: 58.02.02.04 Strunz No: 09.BG.20
Locality:

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