A reference guide to gems, semi-precious stones and crystals. Gemstones and crystals are used for jewellery, industry, lasers and precision technology. Firefly Guide to Gems is a practical, compact guide to the identification and use of precious and semi-precious stones, velty stones, agates and crystals. An introduction explains geology, chemistry and gemstone properties in clear and accessible terms. Key aspects of gemstones are explained such as crystal structures and optical and physical properties. The first section of the book focuses on precious gems in their many forms, with illustrations of priceless jewellery. Practical information includes: Fashioning and cutting Types and shapes of cut Collecting Handling and storing gemstones Weighing and measuring stones The second and main section supplies complete descriptions of a wide range of gems, organized by chemical composition, for instance: Carbon (diamond) Aluminium oxide (sapphire and ruby) Phosphate (turquoise) Silica (opal) A fascinating profile of each gem is accompanied with colour photographs of the raw crystal, common cuts, and finally polished for use in jewellery. At-a-glance charts provide technical details such as refractive index, crystal group, luster, hardness and cleavage for each gem. Easy-to-read and abundantly illustrated, Firefly Guide to Gems is ideal for collectors and rockhounds.
|Publisher||Firefly Books Ltd|
|Date of Publication||18/09/2003|
|Format||Paperback / softback|
|Subject||Natural History: General|
|Series Title||Firefly Guides|
|Place of Publication||Ontario|
|Country of Publication||Canada|
|Imprint||Firefly Books Ltd|
|Format Details||Trade paperback (US),Unsewn / adhesive bound|
|Author Biography||Cally Oldershaw is a mineralogist and Liaison Officer for the Geological Society of London as well as an examiner for the Gemmological Association of Great Britain.|
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