 | David Thomas Ansted - Geology - 1856 - 654 pages
...form six-sided prisms, but often not traceable. The fine azure or indigo-blue varieties are called Sapphire ; the red, Oriental ruby ; the yellow, Oriental topaz ; the green, Oriental emerald ; and the violet, Oriental amethyst. Of these, the ruby is the most valuable, and fine stones often... | |
 | Robert Hunt - Industries - 1862 - 1068 pages
...intermixture of silica and oxide of iron. Sapphire has obtained several names, dependent on its colour and lustre : the transparent or translucent, white sapphire; the blue, oriental sapphire; with pearly reflections, the chatoyant or opalescent sapphire ; when transparent, and with a pale reddish... | |
 | sir William Smith - 1865 - 1392 pages
...groupe — one is crystalline, the other granular; to the crystalline varieties belong the indigo-blue sapphire, the red oriental ruby, the yellow oriental topaz, the green oriental emerald, the violet oriental amethyst, the brown adamantine spar. But it is to the granular or massive variety... | |
 | William Smith - Bible - 1868 - 1090 pages
...groups — one is crystalline, the other granular ; to the crystalline varieties lielong the indigo-blue sapphire, the red oriental ruby, the yellow oriental topaz, the green oriental emerald, the violet oriental amethyst, tha brown adamantine spar. But it is to the granular or massive variety... | |
 | William Smith - 1873 - 920 pages
...groups ; one is crystalline, the other granular ; to the crystalline varieties belong the indigo-blue sapphire, the red oriental ruby, the yellow oriental topaz, the green oriental emerald, the violet oriental amethyst, the brown adamantine spar. Hut it is to the granular or massive variety... | |
 | Josiah Samuel Phillips - Assaying - 1879 - 480 pages
...ordinary emery. "William Phillips gives this paragraph's concise definition of the whole family: " Sapphire has obtained several names, dependent on...transparent, and with a pale reddish or bluish reflection, girasal sapphire. Some, when cut en cabochon, present a silvery, star-like opalescence of six rays,... | |
 | Sir William Smith - Bible - 1892 - 920 pages
...groupa ; one is crystalline, the other granular ; to the crystalline varieties belong the indigo-blue sapphire, the red oriental ruby, the yellow oriental topaz, the green oriental emerald, the violet oriental amethyst, the brown adamantine spar. Hut it is to the granular or massive variety... | |
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adamant harder than flint," '< that by Shamir is intended some variety of Corundum, a mineral inferior only to the diamond in hardness. Of this mineral there are two principal groups ; one is crystalline, the other granular ; to the crystalline varieties... 