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Crystal Structure:
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Cordsen A , The Canadian Mineralogist , 16 (1978) p.153-157, A crystal-structure refinement of libethenite
Physical Properties of Libethenite
Cleavage:
{100} Indistinct, {010} Indistinct
Color:
Green, Dark green, Blackish green, Light olive green, Dark olive green.
Density:
3.6 - 4, Average = 3.8
Diaphaneity:
Translucent to subtranslucent
Fracture:
Brittle - Generally displayed by glasses and most non-metallic minerals.
Habit:
Druse - Crystal growth in a cavity which results in numerous crystal tipped surfaces.
Habit:
Globular - Spherical, or nearly so, rounded forms (e.g. wavellite).
Habit:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Hardness:
4 - Fluorite
Luminescence:
Non-fluorescent.
Luster:
Vitreous - Greasy
Streak:
light green
Optical Properties of Libethenite
Gladstone-Dale:
CI meas= -0.088 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= -0.052 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1897,KPDmeas= 0.1961,KC= 0.1803 Ncalc = 1.65 - 1.72