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Philip's Guide To Gems, Stones And Crystals A practical pocket-sized guide to the identification and use of precious and semiprecious stones, novelty stones, agates and crystals. It covers both the geo... »
Het dikke boek van onze bijzondere aarde <p>WIST JE DAT</p> <ul> <li>meer dan de helft van alle planten en dieren in het regenwoud leven?</li> <li>het grootste deel van een ijsberg onder water zit?<... »
Gemstones This revised edition explores the nature of gems, their beauty, rarity and durability, and the mineral properties that govern these qualities. It describes t... »