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Makovicky E , Skinner B J , American Mineralogist , 60 (1975) p.998-1012, Studies of the sulfosalts of copper. IV. Structure and twinning of sinnerite,, Cu6As4S9
Physical Properties of Sinnerite
Cleavage:
{???} Indistinct
Color:
Steel gray.
Density:
5.2
Diaphaneity:
Opaque
Fracture:
Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Habit:
Columnar - Forms columns
Habit:
Twinning Common - Crystals are usually twinned.
Hardness:
5 - Apatite
Luster:
Metallic
Streak:
grayish black
Calculated Properties of Sinnerite
Electron Density:
Bulk Density (Electron Density)=4.15 gm/cc note: Specific Gravity of Sinnerite =4.47 gm/cc.
Fermion Index:
Fermion Index = 0.0022324178 Boson Index = 0.9977675822
Photoelectric:
PESinnerite = 40.98 barns/electron U=PESinnerite x rElectron Density= 170.06 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Sinnerite is Not Radioactive