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 2.521 and occasionally to 2.795
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