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Physical Properties of Metacinnabar
Cleavage:
None
Color:
Black, Gray black.
Density:
7.7 - 7.8, Average = 7.75
Diaphaneity:
Opaque
Fracture:
Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Habit:
Encrustations - Forms crust-like aggregates on matrix.
Habit:
Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Hardness:
3 - Calcite
Luminescence:
Non-fluorescent.
Luster:
Metallic
Magnetism:
Nonmagnetic
Streak:
black
Optical Properties of Metacinnabar
RL Anisotrophism:
Very weak, occasionally.
RL Color:
Grayish white.
RL Pleochroism:
Weak, occasionally.
Calculated Properties of Metacinnabar
Electron Density:
Bulk Density (Electron Density)=6.36 gm/cc note: Specific Gravity of Metacinnabar =7.71 gm/cc.
Fermion Index:
Fermion Index = 0.26 Boson Index = 0.74
Photoelectric:
PEMetacinnabar =1,479.61 barns/electron U=PEMetacinnabar x rElectron Density=9,414.31 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Metacinnabar is Not Radioactive
Metacinnabar Classification
Dana Class:
02.08.02.03(02)Sulfides - Including Selenides and Tellurides
Chemical Formula: 
