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Andrew's Geology Blog

By Andrew Alden, About.com Guide to Geology since 1997

Kyanite

Saturday September 27, 2008
kyaniteWhen they get metamorphosed, high-aluminum rocks, like your typical shale and slate, tend to grow Al2SiO5. That may form one of three minerals, or polymorphs, depending on the temperature and pressure. Kyanite is the high-pressure, low-temperature form. This rock-shop specimen is cleaner and bluer than your typical occurrence, but not by much. See it and learn more in the Mineral Picture Gallery.
Kyanite — Geology Guide photo

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