The Chemistry, Properties And Tests of Precious Stones

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688Iolite (Cordierite) 7-1/4 2. 641Lapis lazuli 5-1/2 2. 461Sapphire 9 4. 049-4. 060Topaz 8 3. 500-3. 520Tourmaline 7-1/4 3. 160Turquoise 6 2. 800 GREEN STONES.
    _Hardness. _ _Specific Gravity. _ (See Chapter VII. ) (See Chapter VIII. )Aquamarine 7-3/4 2. 701-2. 800Chrysoberyl 8-1/2 3. 689-3. 752Chrysolite 6-7 3. 316-3. 528Chrysoprase (Quartz) 7 2. 670Diamond 10 3. 502-3. 564Dioptase 5 3. 289Emerald and Oriental Emerald 7-3/4 2. 690Euclase 7-1/2 3. 090Garnet (see also Red Garnet) 6-1/2-7-1/2
... 3. 400-4. 500Heliotrope (Chalcedony) 6-1/2 2. 598-2. 610Hiddenite (a variety of Spodumene) 6-1/2-7 3. 130-3. 200Jade 7 3. 300-3. 381Jadeite 7 3. 299Malachite 3-1/2 3. 710-3. 996Peridot (a variety of Chrysolite) 6-7 3. 316-3. 528Plasma (a variety of Chalcedony) 6-1/2 2. 598-2. 610Quartz 7 2. 670Sapphire 9 4. 049-4. 060Topaz 8 3. 500-3. 520Tourmaline 7-1/4 3. 148 VIOLET STONES.
    _Hardness. _ _Specific Gravity. _ (See Chapter VII. ) (See Chapter VIII. )Amethyst 7 2.


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