Group G. -Stones whose specific gravity is under 2.00.
Jet 1.348 Amber 1.000
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Group F. -Stones whose specific gravity lies between 2.00 and under 2.50. Hauynite 2.470 and occasionally to 2.491 Lapis lazuli 2.461 Moldavite 2.354 Opal 2.160 and according to variety to 2.283 Opal (Fire Opal) 2.210 (average) |
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