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Hawthorne F C , Oberti R , Sardone N , The Canadian Mineralogist , 34 (1996) p.577-593, Sodium at the A site in clinoamphiboles: the effects of composition, on patterns of order, Sample: A2 - DJ102 N.4
Physical Properties of Fluoronyboite
Cleavage:
{110} Poor, {110} Poor
Color:
Bluish gray.
Diaphaneity:
Translucent
Fracture:
Brittle - Generally displayed by glasses and most non-metallic minerals.
Habit:
Inclusions - Generally found as inclusions in other minerals.
Hardness:
6 - Orthoclase
Luster:
Vitreous (Glassy)
Streak:
white
Optical Properties of Fluoronyboite
Gladstone-Dale:
CI calc= 0.047 (Good) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.1968,KC= 0.2065 Ncalc = 1.66