Treating of the medicinal virtues of agates, Pliny distinguishes between the Indian agates, which were a remedy for diseases of the eyes and those from Egypt and Crete which were especially adapted for curing the bites of spiders or scorpions. This latter quality was probably attributed to the agate because it was believed to have [...]
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Group E. -Stones whose specific gravity lies between 2.50 and under 3.000. Phenakite 2.965 Turquoise 2.800 Beryl 2.709 and occasionally to 2.81 Aquamarine 2.701 ” 2.80 Labradorite 2.700 Emerald 2.690 Quartz 2.670 Chrysoprase 2.670 Jasper 2.668 Amethyst 2.661 Hornstone 2.658 Citrine 2.658 Cordierite 2.641 Agate 2.610 Chalcedony 2.598 and occasionally to 2.610 Adularia 2.567 Rock-crystal [...] |
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