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(c) Mineral Picture courtesy of www.yuprocks.com
Mineral Picture courtesy of www.yuprocks.com

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.

  

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