Manganvesuvianite Mineral Data

Manganvesuvianite Mineral Data +

General Manganvesuvianite Information

Chemical Formula:

Ca19Mn+++(Al,Mn+++,Fe+++)10(Mg,Mn++)2Si18O69(OH)9

Composition:

Molecular Weight = 2,951.26 gm

Calcium 25.67 % Ca 35.91 % CaO

Magnesium 1.40 % Mg 2.32 % MgO

Manganese 4.84 % Mn 0.96 % MnO / 5.88 % Mn₂O₃

Aluminum 7.86 % Al 14.86 % Al₂O₃

Iron 0.76 % Fe 1.08 % Fe₂O₃

Silicon 16.94 % Si 36.24 % SiO₂

Hydrogen 0.30 % H 2.72 % H₂O

Oxygen 42.23 % O

______ ______

100.00 % 99.97 % = TOTAL OXIDE

Empirical Formula:

Ca_18.9Mn³⁺Al_8.6Mn³⁺_1.2Fe³⁺_0.4Mg_1.7Mn²⁺_0.4Si_17.8O₆₉(OH)_8.9

Environment:

Hydrothermal alteration of primary Mn ores. Found in vugs and veins. Mn-analogue of vesuvianite; structure

IMA Status:

Approved IMA 2002 (Dana # Added)

Locality:

Wessels and N'Chwaning II mines, Kalahari manganese fields, South Africa. Link to MinDat.org Location Data.

Name Origin:

Named for the relationship to vesuvianite (idocrase) and Mn.

Synonym:

IMA2000-040

Idocrase-Mn

Manganidocrase

Vesuvianite-Mn

Manganvesuvianite Image

Images:

Manganvesuvianite

Comments: Dark cherry red prismatic, crystals or manganvisuvianite to 2mm on matrix.
Location: N'Chwanning mine, Kalahari Mn Field, North Cape Province, South Africa. Scale: Picture size 5 mm.
© Tom Loomis / Dakota Matrix

Manganvesuvianite Crystallography

Axial Ratios:

a:c = 1:0.75931

Cell Dimensions:

a = 15.572, c = 11.824, Z = 2; V = 2,867.17 Den(Calc)= 3.42

Crystal System:

Tetragonal - DipyramidalH-M Symbol (4/m) Space Group: P 4/n

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

By Intensity(I/I_o): 2.956(1), 2.756(0.94), 2.756(0.87),2.604(0.67), 2.598(0.66), 2.598(0.62), 2.753(0.6),

Forms:

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Crystal Structure:

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Armbruster T , Gnos E , Dixon R , Gutzmer J , Hejny C , Dobelin N , Medenbach O , Mineralogical Magazine , 66 (2002) p.137-150, Manganvesuvianite and tweddillite, two new Mn3+-silicate minerals, from the Kalahari manganese fields, South Africa, Locality: Kalahari manganese fields, South Africa

Physical Properties of Manganvesuvianite

Color:

Deep maroon red.

Diaphaniety:

Transparent

Fracture:

Brittle - Subconchoidal - Brittle frature with subconchoidal fragments

Habit:

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

Hardness:

6-7 - Orthoclase-Quartz

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Manganvesuvianite

Gladstone-Dale:

CI calc= 0.021 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.212,KC= 0.2165

Optical Data:

Uniaxial (-), e=1.719, w=1.731, bire=0.0120.

Calculated Properties of Manganvesuvianite

Electron Density:

r_electron=3.40 gm/cc
note: r_{Manganvesuvianite}=3.42 gm/cc.

Fermion Index

Fermion Index = 0.01002
Boson Index = 0.98998

Photoelectric:

PE_{Manganvesuvianite}= 5.50 barns/electron
U=PE_{Manganvesuvianite} x r_electron= 18.71 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Manganvesuvianite is Not Radioactive

Manganvesuvianite Classification

Dana Class:

58.2.4.4 (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)

(58.2.4)Vesuvianite Group

58.2.4.1 Vesuvianite Ca10Mg2Al4(SiO4)5(Si2O7)2(OH)4 P 4/n 4/m

58.2.4.2 Wiluite! Ca19(Al,Mg,Fe,Ti)13(B,Al,[])5Si18O68(O,OH)10 P 4/nnc 4/m 2/m 2/m

58.2.4.3 Fluorvesuvianite! Ca19(Al,Mg)13[SiO4]10[Si2O7]4(F,OH)10 P 4/nnc 4/m 2/m 2/m

58.2.4.4 Manganvesuvianite ! Ca19Mn(Al,Mn,Fe)10(Mg,Mn)2Si18O69(OH)9 P 4/n 4/m

Strunz Class:

VIII/C.26-03 VIII - Silicates

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

VIII/C.26 - Vesuvianite series

VIII/C.26-03 Manganvesuvianite Ca19Mn(Al,Mn,Fe)10(Mg,Mn)2Si18O69(OH)9 P 4/n 4/m

VIII/C.26-05 Fluorvesuvianite! Ca19(Al,Mg)13[SiO4]10[Si2O7]4(F,OH)10 P 4/nnc 4/m 2/m 2/m

VIII/C.26-10 Vesuvianite Ca10Mg2Al4(SiO4)5(Si2O7)2(OH)4 P 4/n 4/m

VIII/C.26-20 Wiluite! Ca19(Al,Mg,Fe,Ti)13(B,Al,[])5Si18O68(O,OH)10 P 4/nnc 4/m 2/m 2/m

Other Manganvesuvianite Information

References:

NAME( AmMin, Vol 88, p 251) PHYS. PROP.(AmMin, Vol 88, p 251) OPTIC PROP.(AmMin, Vol 88, p 251)

See Also:

Links to other databases for Manganvesuvianite :
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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Manganvesuvianite

Ca19Mn+++(Al,Mn+++,Fe+++)10(Mg,Mn++)2Si18O69(OH)9
Dana No: 58.2.4.4 Strunz No: VIII/C.26-03
Locality:

Notes: