General Manganvesuvianite Information
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Chemical Formula: |
Ca19Mn+++(Al,Mn+++,Fe+++)10(Mg,Mn++)2Si18O69(OH)9 |
Composition: |
Molecular Weight = 2,951.26 gm |
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Calcium 25.67 % Ca 35.91 % CaO |
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Magnesium 1.40 % Mg 2.32 % MgO |
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Manganese 4.84 % Mn 0.96 % MnO / 5.88 % Mn2O3 |
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Aluminum 7.86 % Al 14.86 % Al2O3 |
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Iron 0.76 % Fe 1.08 % Fe2O3 |
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Silicon 16.94 % Si 36.24 % SiO2 |
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Hydrogen 0.30 % H 2.72 % H2O |
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Oxygen 42.23 % O |
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______ ______ |
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100.00 % 99.97 % = TOTAL OXIDE |
Empirical Formula: |
Ca18.9Mn3+Al8.6Mn3+1.2Fe3+0.4Mg1.7Mn2+0.4Si17.8O69(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 |
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Idocrase-Mn |
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Manganidocrase |
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Vesuvianite-Mn |
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Manganvesuvianite Image |
Images:
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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 |
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Manganvesuvianite Crystallography
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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 |
X Ray Diffraction: |
By Intensity(I/Io): 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), |
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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
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Physical Properties of Manganvesuvianite
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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 |
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Optical Properties of Manganvesuvianite
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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. |
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Calculated Properties of Manganvesuvianite
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Electron Density: |
relectron=3.40 gm/cc note: rManganvesuvianite =3.42 gm/cc. |
Fermion Index |
Fermion Index = 0.01002 Boson Index = 0.98998 |
Photoelectric: |
PEManganvesuvianite = 5.50 barns/electron U=PEManganvesuvianite x relectron= 18.71 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Manganvesuvianite is Not Radioactive |
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Manganvesuvianite Classification
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Dana Class: |
58.2.4.4 (58)Sorosilicate Insular, Mixed, Single, and Larger Tetrahedral Groups |
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(58.2)with cations in [6] and higher coordination; single and double groups (n=1,2) |
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(58.2.4)Vesuvianite Group |
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58.2.4.1 Vesuvianite Ca10Mg2Al4(SiO4)5(Si2O7)2(OH)4 P 4/n 4/m |
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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 |
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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 |
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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 |
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VIII/C - Sorosilicates, mixed structure with [SiO4]2- "inseln" and [Si2O7]6- groups |
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VIII/C.26 - Vesuvianite series |
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VIII/C.26-03 Manganvesuvianite Ca19Mn(Al,Mn,Fe)10(Mg,Mn)2Si18O69(OH)9 P 4/n 4/m |
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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 |
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VIII/C.26-10 Vesuvianite Ca10Mg2Al4(SiO4)5(Si2O7)2(OH)4 P 4/n 4/m |
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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 |
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Other Manganvesuvianite Information
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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:
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