Other Natural Mineral Crystals
Ruby, sapphire, kyanite, topaz, iolite, zircon and more.
A group of important gem and mineral crystals: corundum (ruby and sapphire), chrysoberyl and its varieties, topaz, zircon, iolite, spinel and the aluminium silicates kyanite, sillimanite and andalusite.
Many occur in India — iolite in Odisha and Tamil Nadu, corundum in Karnataka, and the historic blue sapphires of Kashmir.
14 crystals in the Other Natural Mineral Crystals
Silicate Kyanite
Blade-shaped blue crystals that never need cleansing — so they say.
Silicate Sillimanite
Fibrous aluminium silicate from India and Sri Lanka.
Silicate Andalusite
Colour-shifting stone; chiastolite shows a natural cross.
Silicate Staurolite
Brown crystals that twin into a natural cross.
Oxide Corundum
The second-hardest natural mineral.
Corundum Ruby
Red corundum, the king of gems.
Corundum Sapphire
Blue (and many other colours of) corundum.
Oxide Spinel
Octahedral crystals once mistaken for ruby.
Oxide Chrysoberyl
Very hard yellow-green beryllium oxide.
Chrysoberyl Alexandrite
The colour-change gem: green by day, red by lamp light.
Chrysoberyl Cat's Eye Chrysoberyl
Honey chrysoberyl with a sharp line of light (Lehsunia).
Silicate Zircon
Natural brilliant gem — not cubic zirconia.
Silicate Topaz
Hard, glassy crystals in gold, blue and clear.
Cordierite Iolite
Violet-blue gem that changes colour as you turn it.
Photo credits
- Photo: Géry PARENT — CC BY-SA 3.0, via Wikimedia Commons — source
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Other crystal families
Quartz Family
Amethyst, rose quartz, citrine, agate, jasper and every form of silica.
17 crystals
Zeolite & Related Crystals
Apophyllite, stilbite, cavansite and okenite from the Deccan traps.
9 crystals
Garnet Family
Almandine, pyrope, hessonite and other garnets.
8 crystals
Beryl Family
Emerald, aquamarine, morganite, heliodor and goshenite.
5 crystals
Tourmaline Family
Black, green, pink, blue and watermelon tourmaline.
6 crystals
Mica Family
Muscovite, lepidolite, fuchsite, biotite and phlogopite.
4 crystals
Feldspar Family
Moonstone, sunstone, labradorite, amazonite and more.
7 crystals
Copper & Metallic Minerals
Malachite, azurite, pyrite, hematite, galena and other ores.
9 crystals
Other Indian Mineral Specimens
Graphite, talc, chromite, rutile, apatite, diamond and rare earths.
12 crystals
Additional Natural Crystals
Fluorite, calcite, aragonite, dolomite, gypsum and selenite.
6 crystals