(a species of owlet moth (Noctuid)) Some caterpillars, after they emerge from their egg, can increase their weight by 25,000 times.

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Earth sciences books

Gemstones (2nd edition)

Gemstones

Discover the dazzling world of gemstones in this colourful, best-selling book.

ISBN: 0565091557

Author: Cally Oldershaw, Christine Woodward and Roger Harding

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Gemstones (2nd edition)

£ 7.95

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A new edition of this popular book explores the nature of gems, their beauty, rarity and durability, and the mineral properties that govern these qualities. It describes the most popular gemstones in detail and looks at how gem minerals form, where they are found and mined, and how they are identified. Discover the dazzling world of gemstones in this colourful, best-selling book.

Product information

Paperback, 200 x 210 mm, 76pp, 1987, 2001, Illustrated in colour throughout, 0 565 09155 7. Published by the Natural History Museum.