Crystal & gem
written by R. F. Symes and R. R. HardingDorling Kindersley, 1991
64 p. : color ill. ; 29 cm.
書
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- Describes how crystals form in nature, how crystals are grown artificially, and how crystals are used in industry. Numerous color photos with text identify the various gemstones.
- London : Dorling Kindersley
- 0863185754 (hbk)
- http://library.bethel.edu.hk/opac/bib/AGHk
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