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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.
Diaphaneity:
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= 0.029 (Excellent) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.212,KC= 0.2184 Ncalc = 1.75
Optical Data:
Uniaxial (-), e=1.719, w=1.731, bire=0.0120.
Calculated Properties of Manganvesuvianite
Electron Density:
Bulk Density (Electron Density)=3.40 gm/cc note: Specific Gravity of Manganvesuvianite =3.42 gm/cc.
Fermion Index:
Fermion Index = 0.01 Boson Index = 0.99
Photoelectric:
PEManganvesuvianite = 5.50 barns/electron U=PEManganvesuvianite x rElectron Density= 18.71 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Manganvesuvianite is Not Radioactive
Manganvesuvianite Classification
Dana Class:
58.02.04.04(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)