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Crystal Structure:
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Wenk H R , Joswig W , Tagai T , Korekawa M , Smith B K , American Mineralogist , 65 (1980) p.81-95, The average structure of An 62-66 labradorite, Surtsey x-ray, feldspar
Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Habit:
Crystalline - Coarse - Occurs as well-formed coarse sized crystals.
Habit:
Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Habit:
Striated - Parallel lines on crystal surface or cleavage face.
Hardness:
7 - Quartz
Luminescence:
Non-fluorescent.
Luster:
Vitreous (Glassy)
Streak:
white
Optical Properties of Labradorite
Gladstone-Dale:
CI meas= -0.009 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= 0.043 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1983,KPDmeas= 0.2089,KC= 0.2071 Ncalc = 1.56 - 1.59