Tropical Gemstones (Periplus Nature Guides)
Publisher: Tuttle Publishing
Published: August 1998
Language: eng
Format: Hardcover
Number of pages: 64
ISBN-13: 9789625931845
Subjects: Science; Tropical Ecology; Gems; Nature; Nature/Ecology; Tropics; Earth Sciences - Geology; Rocks & Minerals; Earth Sciences - Mineralogy
First sentence: One of the most durable of gems-second in hardness only to diamond-the ruby is a crystalline form of aluminium oxide, infused with trace elements of chromium which gives the gemstone its red color.