Okhotskite-(Mg) Mineral Data

Okhotskite-(Mg) Mineral Data +

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General Okhotskite-(Mg) Information

Chemical Formula:

Ca3(Mg,Mn++)(Mn+++,Al,Fe+++)(SiO4)(Si2O7)(OH)2·(H2O)

Composition:

Molecular Weight = 518.28 gm

Calcium 14.69 % Ca 20.56 % CaO

Magnesium 3.28 % Mg 5.44 % MgO

Manganese 13.78 % Mn 4.11 % MnO / 15.23 % Mn₂O₃

Aluminum 2.60 % Al 4.92 % Al₂O₃

Iron 5.39 % Fe 7.70 % Fe₂O₃

Silicon 16.26 % Si 34.78 % SiO₂

Hydrogen 0.78 % H 6.95 % H₂O

Oxygen 43.22 % O

______ ______

100.00 % 99.69 % = TOTAL OXIDE

Empirical Formula:

Ca_1.9Mg_0.7Mn²⁺_0.3Mn³⁺Al_0.5Fe³⁺_0.5(SiO₄)(Si₂O₇)(OH)₂·(H₂O)

IMA Status:

Not Approved IMA 1987

Locality:

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.

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Okhotskite-(Mg) Crystallography

Crystal System:

Monoclinic

Calculated Properties of Okhotskite-(Mg)

Fermion Index

Fermion Index = 0.01242
Boson Index = 0.98758

Photoelectric:

PE_{Okhotskite-(Mg)}= 7.65 barns/electron
U=PE_{Okhotskite-(Mg)} x r_electron= . barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Okhotskite-(Mg) is Not Radioactive

Okhotskite-(Mg) Classification

Dana Class:

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

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

(58.2.2)Pumpellyite group

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

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

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

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

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

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

58.2.2.7 Pumpellyite-(Mg) Ca2MgAl2(SiO4)(Si2O7)(OH)2·(H2O) A2/m 2/m

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

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

Strunz Class:

VIII/C.24-80 VIII - Silicates

VIII/C - Sorosilicates, mixed structure with [SiO4]2- "inseln" and [Si2O7]6- groups

VIII/C.24 - Pumpellyite group

VIII/C.24-10 Macfallite Ca2(Mn,Al)3(SiO4)(Si2O7)(OH)3 P 2₁/m 2/m

VIII/C.24-20 Sursassite Mn2Al3(SiO4)(Si2O7)(OH)3 P 2₁/m 2/m

VIII/C.24-30 Pumpellyite-(Mg) Ca2MgAl2(SiO4)(Si2O7)(OH)2·(H2O) A2/m 2/m

VIII/C.24-40 Pumpellyite-(Fe++) Ca2Fe(Al,Fe)2(SiO4)(Si2O7)(OH)2·(H2O) A2/m 2/m

VIII/C.24-42 Pumpellyite-(Fe+++) Ca2FeAl2(SiO4)(Si2O7)(OH,O)2·(H2O) A2/m 2/m

VIII/C.24-50 Pumpellyite-(Mn++) Ca2(Mn,Mg)(Al,Mn,Fe)2(SiO4)(Si2O7(OH)2·(H2O) A2/m 2/m

VIII/C.24-60 Julgoldite-(Fe++) Ca2Fe(Fe,Al)2(SiO4)(Si2O7)(OH)2·(H2O) C 2/m 2/m

VIII/C.24-61 Julgoldite-(Fe+++) Ca2Fe(Fe,Al)2(SiO4)(Si2O7)(O,OH)2·(H2O) A2/m 2/m

VIII/C.24-70 Shuiskite Ca2(Mg,Al)(Cr,Al)2(SiO4)(Si2O7)(OH)2·(H2O) A2/m 2/m

VIII/C.24-80 Okhotskite-(Mg) Ca3(Mg,Mn)(Mn,Al,Fe)(SiO4)(Si2O7)(OH)2·(H2O) Mono

VIII/C.24-80* Okhotskite-(Mn++) Ca2(Mn,Mg)(Mn,Al,Fe)Si3O10(OH)4 A2/m 2/m

VIII/C.24-90 Samfowlerite Ca14Mn3Zn2(Be,Zn)2Be6(SiO4)6(Si2O7)4(OH,F)6 P 2₁/c 2/m

Other Okhotskite-(Mg) Information

References:

NAME( Dana8)

See Also:

Links to other databases for Okhotskite-(Mg) :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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Okhotskite-(Mg)

Ca3(Mg,Mn++)(Mn+++,Al,Fe+++)(SiO4)(Si2O7)(OH)2·(H2O)
Dana No: 58.2.2.3 Strunz No: VIII/C.24-80
Locality:

Notes: