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Crystal Structure:
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Colville A A , Ribbe P H , American Mineralogist , 53 (1968) p.25-37, The crystal structure of an adularia and a refinement of the structure of, orthoclase, Note: Spencer B, variety adularia
Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Habit:
Blocky - Crystal shape tends to be equant (e.g. feldspars).
Habit:
Massive - Granular - Common texture observed in granite and other igneous rock.
Habit:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Hardness:
6 - Orthoclase
Luminescence:
Non-fluorescent.
Luster:
Vitreous (Glassy)
Streak:
white
Optical Properties of Orthoclase
Gladstone-Dale:
CI meas= 0.011 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= 0.007 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2044,KPDmeas= 0.2036,KC= 0.2058 Ncalc = 1.52 - 1.53