K Y A N I T E
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KyaniteAl2SiO5
Class: Silicate Subclass: Nesosilicate Hardness: 5.5 - 7 Density: 3.5 - 3.7 Streak: White Lustre: Vitreous Habit: Massive aggregate, with striated faces. Colours: Bluish white (typical) | | Crystal System: Triclinic Cleavage: Perfect Fracture: Uneven Magnetism: None Reaction with HCl: Unknown | Identification in hand sample: Bladed habit, colour, and difference of hardness along and across cleavages Associations: Forms in metamorphs, especially in gneisses and schists Comments: Kyanite has a hardness of 6-7 across cleavage planes, but only 4-5 along cleavage planes. Colour is typical, yet other colours (gray, white or less commonly light green) do occur. |