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Ballirano P , Maras A , Meloni S , Caminiti R , European Journal of Mineralogy , 13 (2001) p.985-993, The monoclinic I2 structure of bassanite, calcium sulphate hemihydrate
Physical Properties of Bassanite
Color:
Colorless, Snow white.
Density:
2.7
Diaphaneity:
Transparent to Translucent
Habit:
Acicular - Occurs as needle-like crystals.
Habit:
Microscopic Crystals - Crystals visible only with microscopes.
Luster:
Earthy (Dull)
Streak:
white
Optical Properties of Bassanite
Gladstone-Dale:
CI meas= -0.038 (Excellent) - where the CI = (1-KPDmeas/KC) CI calc= -0.026 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2051,KPDmeas= 0.2074,KC= 0.1999 Ncalc = 1.54 - 1.55
Optical Data:
Uniaxial (+), w=1.55, e=1.57, bire=0.0200.
Calculated Properties of Bassanite
Electron Density:
Bulk Density (Electron Density)=2.75 gm/cc note: Specific Gravity of Bassanite =2.73 gm/cc.
Fermion Index:
Fermion Index = 0.0022687697 Boson Index = 0.9977312303
Photoelectric:
PEBassanite = 4.71 barns/electron U=PEBassanite x rElectron Density= 12.94 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Bassanite is Not Radioactive