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Cooper M A , Hawthorne F C , The Canadian Mineralogist , 35 (1997) p.777-784, The crystal structure of wicksite
Physical Properties of Wicksite
Cleavage:
{010} Good
Color:
Bluish black, Dark blue, Black.
Density:
3.54
Hardness:
4.5-5 - Near Apatite
Luster:
Sub Metallic
Streak:
green
Optical Properties of Wicksite
Gladstone-Dale:
CI meas= 0.008 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= 0.019 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.201,KPDmeas= 0.2033,KC= 0.2049 Ncalc = 1.73