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Berlepsch P , Armbruster T , Brugger J , Bykova E Y , Kartashov P M , European Journal of Mineralogy , 11 (1999) p.101-110, The crystal structure of vergasovaite Cu3O[(Mo,S)O4SO4],, and its relation to synthetic Cu3O[MoO4]2
Physical Properties of Vergasovaite
Cleavage:
None
Color:
Olive green.
Diaphaneity:
Transparent
Fracture:
Brittle - Uneven - Very brittle fracture producing uneven fragments.
Habit:
Aggregates - Made of numerous individual crystals or clusters.
Habit:
Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Hardness:
4-5 - Fluorite-Apatite
Luster:
Vitreous (Glassy)
Streak:
light yellow
Optical Properties of Vergasovaite
Gladstone-Dale:
CI calc= -0.131 (Poor) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2126,KC= 0.1881 Ncalc = 1.82
Optical Data:
Biaxial (?), a=1.87, g=1.98, bire=0.1100
RL Color:
Gray with light green to colorless internal reflections.
Calculated Properties of Vergasovaite
Electron Density:
Bulk Density (Electron Density)=4.10 gm/cc note: Specific Gravity of Vergasovaite =4.35 gm/cc.
Fermion Index:
Fermion Index = 0.04 Boson Index = 0.96
Photoelectric:
PEVergasovaite = 47.30 barns/electron U=PEVergasovaite x rElectron Density= 193.85 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Vergasovaite is Not Radioactive
Vergasovaite Classification
Dana Class:
48.04.03.01(48)Anhydrous Molybdates and Tungstates