VARLEY, E.R. - Sillimanite, Andalusite, Kyanite, Sillimanite.

London, Hmso. 1965, First Edition. Soft cover, 8vo - over 7¾" - 9¾" tall. Book, 165 pages. A little wear to covers. Sillimanite is one of three alumino-silicate polymorphs, the other two being andalusite and kyanite. Natural sillimanite rocks cut into the required shape and size are used mainly in glass industries. Sillimanite is the best raw material for the manufacture of high alumina refractories or 55-60% alumina bricks. But its use on large scale is not possible due to its fine grading and high cost. Very Good.

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