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Wyckoff R W G , Crystal Structures , 1 (1963) p.239-444, Second edition. Interscience Publishers, New York, New York, Note: cadmium iodide structure
Physical Properties of Theophrastite
Color:
Emerald green.
Density:
4
Diaphaneity:
Transparent
Fracture:
Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Hardness:
3.5 - Copper Penny
Luster:
Vitreous (Glassy)
Streak:
light green
Optical Properties of Theophrastite
Gladstone-Dale:
CI meas= 0.087 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= 0.07 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1933,KPDmeas= 0.1899,KC= 0.2079 Ncalc = 1.82 - 1.83