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Wyckoff R W G , Crystal Structures , 1 (1963) p.85-237, Second edition. Interscience Publishers, New York, New York, Note: wurtzite structure
Physical Properties of Moissanite
Cleavage:
{0001} Indistinct
Color:
Blue, Colorless, Green, Green yellow, Yellow.
Density:
3.218 - 3.22, Average = 3.21
Diaphaneity:
Transparent to Opaque
Fracture:
Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Habit:
Inclusions - Generally found as inclusions in other minerals.
Habit:
Microscopic Crystals - Crystals visible only with microscopes.
Hardness:
9.5 - Silicon Carbide
Luster:
Metallic
Streak:
greenish gray
Optical Properties of Moissanite
Dichroism (e):
weak blue.
Dichroism (w):
weaker blue.
Optical Data:
Uniaxial (+), w=2.654, e=2.967, bire=0.3130.
Calculated Properties of Moissanite
Electron Density:
Bulk Density (Electron Density)=3.21 gm/cc note: Specific Gravity of Moissanite =3.22 gm/cc.
Fermion Index:
Fermion Index = 0.03 Boson Index = 0.97
Photoelectric:
PEMoissanite = 2.39 barns/electron U=PEMoissanite x rElectron Density= 7.67 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Moissanite is Not Radioactive