Abstract
THIS is a well-illustrated account of gem minerals, in two parts. The authors remark in a brief introduction that the study of gem minerals has been named “gemmology,” but it is a great relief to have their assurance that this term is not widely used. Part 1 (pp. 9–104) deals with the general properties of minerals, including chapters on the genesis, cutting and polishing, naming and manufacture of gem stones. Part 2 (pp. 107–213) gives descriptions of the various minerals used as gems, and includes numerous tables in which gem minerals are classified according to their properties. The last of these tables gives a summary of the properties of gem minerals described in the text, the arrangement of the minerals being alphabetical. The book concludes with a useful index.
Gems and Gem Materials.
Prof.
E. H.
Kraus
Dr.
E. F.
Holden
By. Pp. vii + 222. (New York: McGraw-Hill Book Co., Inc.; London: McGraw-Hill Publishing Co., Ltd., 1925.) 15s. net.
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Gems and Gem Materials . Nature 117, 752 (1926). https://doi.org/10.1038/117752e0
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DOI: https://doi.org/10.1038/117752e0