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Moore P B , Araki T , American Mineralogist , 59 (1974) p.985-1004
Brittle - Uneven - Very brittle fracture producing uneven fragments.
Habit:
Crystalline - Fine - Occurs as well-formed fine sized crystals.
Habit:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Hardness:
3-4 - Calcite-Fluorite
Luminescence:
Non-fluorescent.
Luster:
Vitreous - Silky
Streak:
bluish black
Optical Properties of Warwickite
Gladstone-Dale:
CI meas= 0.169 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= 0.241 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2215,KPDmeas= 0.2426,KC= 0.2918 Ncalc = 1.98 - 2.07