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Callegari A , Mazzi F , Tadini C , European Journal of Mineralogy , 15 (2003) p.277-282, Modular aspects of the crystal structures of kurchatovite and clinokurchatovite, Locality: Sayak, Kazackhstan
Physical Properties of Clinokurchatovite
Color:
Light gray.
Density:
3.07 - 3.08, Average = 3.07
Hardness:
4.5 - Between Fluorite and Apatite
Streak:
gray white
Optical Properties of Clinokurchatovite
Gladstone-Dale:
CI meas= -0.055 (Good) - where the CI = (1-KPDmeas/KC) CI calc= 0.002 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2071,KPDmeas= 0.2189,KC= 0.2074 Ncalc = 1.64 - 1.67