Refractive Indices of Gem-Stones[8] | Opal | 1·454 | | Moonstone | 1·53 | 1·54 | | Iolite | 1·543 | 1·551 | | Quartz | 1·544 | 1·553 | | Beryllonite | 1·553 | 1·565 | | Beryl | 1·578 | 1·585 | | Turquoise | 1·61 | 1·65 | | Topaz | 1·618 | 1·627 | | Andalusite | 1·632 | 1·643 | | Tourmaline | 1·626 | 1·651 | | Apatite | 1·642 | 1·646 | | Phenakite | 1·652 | 1·667 | | Euclase | 1·651 | 1·670 | | Spodumene | 1·660 | 1·675 | | Enstatite | 1·665 | 1·674 | | Peridot | 1·659 | 1·697 | | Axinite | 1·674 | 1·684 | | Diopside | 1·685 | 1·705 | | Idocrase | 1·714 | 1·719 | | Spinel | 1·726 | | Kyanite | 1·72 | 1·73 | | Epidote | 1·735 | 1·766 | | Garnet (Hessonite) | 1·745 | | Chrysoberyl | 1·746 | 1·753 | | Garnet (Pyrope) | 1·755 | | Benitoite | 1·757 | 1·804 | | Corundum | 1·761 | 1·770 | | Garnet (Almandine) | 1·790 | | Zircon (a) | 1·815 | | Garnet (Demantoid) | 1·885 | | Sphene | 1·901 | 1·985 | | Zircon (b) | 1·927 | 1·980 | | Diamond | 2·417 |
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