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Search Location   All Locations California Colombo Ohio Category   All Categories Alexandrite Alexandrite Catseye Amethyst Ametrine Andalucite Apatite Apatite Cat's Eye Aquamarine Aquamarine Cat's Eye Bargain Lots Beryl Chrysoberyl Chrysoberyl Catseye Chrysoberyl Stars Citrine Cobalt Spinel Crystals Diopside Diopside Cat's Eye Diopside Star Enstatite Feldspar Fluorite Garnet Garnet Color Change Garnet Grossular Garnet Hessonite Garnet Rhodolite Garnet Spessartine Garnet Star Garnet Tsavorite Investment Gems Iolite Konerupine Kunzite Kyanite Lime Citrine Moonstone Mystic Topaz Opal Padparasha Pairs Peridot Quartz Quartz Catseye Quartz Stars Rare Gems & Minerals Ruby Ruby Star Rutile Sapphire Blue Sapphire Cats Eye Sapphire Green Sapphire Lavender Sapphire Other Sapphire Pink Sapphire Purple Sapphire White Sapphire Yellow Scapolite Scheelite Silimanite Silimanite Catseye Sinhalite Special Cut Gems Sphene Spinel Spinel Star StarSapphire Taaffeite Topaz Topaz Catseye Tourmaline Tourmaline Bi-Color Tourmaline Chrome Tourmaline Col/Chg Zircon       Alexandrite Enstatite Opal Scapolite Alexandrite Catseye Feldspar Padparasha Silimanite Catseye Amethyst Fluorite Peridot Sinhalite Ametrine Garnet Quartz Sphene Andalucite Garnet Color Change Quartz Catseye Spinel Apatite Garnet Grossular Quartz Stars Spinel Star Apatite Cat's Eye Garnet Hessonite Ruby Star Sapphire Aquamarine Garnet Rhodolite Ruby Star Taaffeite Aquamarine Cat's Eye Garnet Spessartine Rutile Topaz Beryl Garnet Star Sapphire Blue Topaz Catseye Chrysoberyl Garnet Tsavorite Sapphire Cats Eye Tourmaline Chrysoberyl Catseye Iolite Sapphire Green Tourmaline Bi-Color Chrysoberyl Stars Konerupine Sapphire Lavender Tourmaline Col/Chg Citrine Kunzite Sapphire Other Zircon Cobalt Spinel Kyanite Sapphire Pink     Diopside Lime Citrine Sapphire Purple     Diopside Cat's Eye Moonstone Sapphire White     Diopside Star Mystic Topaz Sapphire Yellow       Kyanite is a mineral infrequently cut as a gemstone. It occurs in light to dark blue, green, colorless and brown colors in a transparent form with the blue color being most used in gemstones. Kyanite is of interest because of the extreme variablity in hardness with direction. In one direction, the hardness is 4.5 and in the other it is 7. Very easy cleavage is encountered in one direction with a less perfect cleavage occurring at 74 degrees to the first. The finest gem quality Kyanite may be confused in appearance with spinel or blue sapphires from Burma. Gemological Information Color : Blue, Greenish Blue. Refractive Index: 1.716 – 1.731 Chemical Composition: AL2SIO5 Hardness: 4.5 – 7.0 Density: 3.56 – 3.68 Crystal Group: Triclinic Ocurrence: Kenya, Nepal, India, Burma,U.S.A.