Mineral GuideGems
How the Earth was Formed
Marbles
Mineral Gallery
Mining of Metals
Minor Gems
Ores
Petroleum
Precious Stones
Agate gem stone
Amber gem stone
Beryl gem stone
Birth Stones
Chrysolite gem stone
Crystalline Quartz gem stones
Diamond gem stone and Corundum
Epidote gem stone
Feldspar gem stone
Garnet gem stone
Lapis Lazuli gem stone
Malachite gem stone
Obscurely Crystalline Quartz gem stones
Basanite gem stone
Bloodstone gem stone
Carnelian gem stone
Chalcedony gem stone
Chrysoprase gem stone
Flint gem stone
Jasper gem stone
Onyx gem stone
Sard gem stone
Sardonyx gem stone<
Opal gem stone
Ornamental gem stones
Topaz gem stone
Tourmaline gem stone
Turquoise gem stone
Quartz and the Silicates
Useful websites
Sardonyx gem stone
The sardonyx was supposed by the ancients to be a different stone from the onyx. To it was ascribed the property of conferring eloquence upon its wearer.