Descriptions of Gem Materials, Second Edition

Descriptions of Gem Materials, Second Edition. Written & published by Glenn & Martha Vargas, Thermal, CA, 1979. 2nd Edition. Hardbound, No DJ. Size 4to (up to 12'' tall). Condition: Nr Fine. Orig owners name in ink on top corner title page. Signed by both authors under title & above their names on title page. Brown cloth covering wearing thin in a few spots on spine edge and top front edge. Content excellent. 140 Pgs. 0917646045. LCCN 79-65857. Contents: Intro & explanation of terms. Descriptions of natural gem materials. Descriptions of man-made gem materials. Hardness of gem materials in ascending order (including hardness & specific gravity of metals). Specific gravities of gem materials in ascending order. Refractive indices of gem materials in ascending order. Index of alternative, varietal, and incorrect names. Bibliography of selected references. Description text copyright 2017 www.BooksForComfort.net. Item ID 32430.