Roger Weller, geology instructor
email@example.com copyright 2016-R.Weller
kyanite crystals in schist-4
Kyanite is aluminum silicate. It is a metamorphic mineral that forms blue blade-like
crystals. Often the crystals are darker color near the center and a lighter color
towards the outer edges of the blades. Kyanite is unique in that it has two different
hardness depending upon direction. Kyanite commonly occurs in a schist. Parallel
to the length of the crystal kyanite has a hardness of 5; at right right angles to this
direction it is 7.
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