— 2.1 Oriental amethyst │ 9. │ 3.9 — 4.1 " aquamarine │ 9. │ 3.9 — 4.1 " chrysolite │ 9. │ 3.9 — 4.1 " emerald │ 9. │ 3.9 — 4.1 " hyacinth │ 9. │ 3.9 — 4.1 " topaz │ 9. │ 3.9 — 4.1 Pearl │ │ 2.5 — 2.7 Peridot │ 6.5 — 7. │ 3.3 — 3.5 Phenacite │ 7.5 — 8. │ 2.96 — 3. Pyrope │ 7.5 │ 3.69 — 3.78 Quartz │ 7. │ 2.5 — 2.8 " cat’s-eye │ 6. — 6.5 │ 2.65 Rose quartz │ 7. │ 2.65 — 2.75 Rubellite │ 7. — 7.5 │ 3. — 3.1 Ruby │ 9. │ 3.9 — 4.1 " cat’s-eye │ 9. │ 3.9 — 4.1 Sapphire │ 9. │ 3.9 — 4.1 " cat’s-eye │ 9. │ 3.9 — 4.1 Siberite │ 7. — 7.5 │ 3. — 3.1 Sphene │ 5. — 5.5 │ 3.4 — 3.56 Spinel │ 8. │ 3.5 — 3.6 Spodumene │ 6.5 — 7. │ 3.13 — 3.19 Star ruby │ 9. │ 3.9 — 4.1 " sapphire │ 9. │ 3.9 — 4.1 " topaz │ 9. │ 3.9 — 4.1 Sunstone │ 6. — 7. │ 2.56 — 2.72 Syrian garnet │ 7.5 │ 4. — 4.42 Titanite │ 5. — 5.5 │ 3.4 — 3.56 Topaz │ 8. │ 3.4 — 3.6 Tourmaline │ 7. — 7.5 │ 3. — 3.1 Turquois │ 6. │ 2.6 — 2.8 Uwarowite │ 7.5 │ 3.41 — 3.52 Vesuvianite │ 6.5 │ 3.35 — 3.45 Water sapphire │ 7. — 7.5 │ 2.56 — 2.67 ────────────────────┴───────────┴────────────── GENERAL INDEX. Achroite, 64 Actinolite, 29 Adularia, see moonstone Agate jasper, 120 Agate onyx, see onyx Agate, see quartz, 106, 119, 122, 123, 124, 126 Alexandrite, 8, 54, 56 Almandine, 9, 30, 80 Almandite, 29, 80 Amazon stone, 17, 88, 91 Amber, 17, 128 American ruby, 80, 83 Amethyst, 8, 9, 16, 17, 44, 49, 107, 110, 111 Amethystine quartz, see amethyst Antimony, 29 Apatite, 19, 87 Aquamarine, 8, 16, 53 Aquamarine chrysolite, 53 Arizona ruby, 80, 83 Asterias, see star sapphires Aurora red sapphire, see Oriental hyacinth Avanturine, 113, 114 Avanturine felspar, see sunstone Axinite, 17, 102 Balas ruby, 48 Banded agate, 119 Beckite, 120 Beryl, 14, 16, 17, 44, 50, 52, 53, 87 Blood-stone, see heliotrope " see hematite Bobrowska garnet, 80, 83 Bohemian garnet, 80 82 " diamond, see rock-crystal " topaz, see yellow quartz Bone turquois, 62 Bort, 38 Brazilian aquamarine, 85 " emerald, 64, 67 " ruby, 85 " sapphire, 85 " topaz, see topaz Bronzite, 30