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Crystal Structure:
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Baur W H , Acta Crystallographica , 9 (1956) p.515-520, Uber die verfeinerung der kristallstrukturbestimmung einiger vertreter, des rutiltyps: TiO2, SnO2, GeO2 und MgF2
View Additional jPOWD Structure files for Cassiterite
[1]
[2]
Physical Properties of Cassiterite
Cleavage:
{100} Perfect, {110} Indistinct
Color:
Brown, Brownish black, Colorless, Green, Gray.
Density:
6.8 - 7, Average = 6.9
Diaphaneity:
Transparent to translucent to opaque
Fracture:
Irregular - Flat surfaces (not cleavage) fractured in an irregular pattern.
Habit:
Botryoidal - "Grape-like" rounded forms (e.g.. malachite).
Habit:
Massive - Uniformly indistinguishable crystals forming large masses.
Habit:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Hardness:
6-7 - Orthoclase-Quartz
Luminescence:
Non-fluorescent.
Luster:
Adamantine
Streak:
brownish white
Optical Properties of Cassiterite
Dichroism (e):
yellow.
Dichroism (w):
red brown.
Gladstone-Dale:
CI meas= -0.062 (Fair) - where the CI = (1-KPDmeas/KC) CI calc= -0.025 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1466,KPDmeas= 0.1519,KC= 0.143 Ncalc = 1.97 - 2.02