Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Habit:
Tabular - Form dimensions are thin in one direction.
Hardness:
6.5 - Pyrite
Luster:
Adamantine
Streak:
gray
Optical Properties of Magnesiohogbomite-2N2S
Gladstone-Dale:
CI meas= 0.005 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= 0.057 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2069,KPDmeas= 0.2183,KC= 0.2193 Ncalc = 1.84 - 1.88