Mineral GuideGems
How the Earth was Formed
Marbles
Mineral Gallery
Agate gem stone
Amethyst gem stone
Crocidolite gem stone
Hornblende gem stone
Hornblende picture<
Malachite gem stone
Quartz gem stone
Serpentine gem stone
Sulphur gem stone
Tourmaline gem stone
Mining of Metals
Minor Gems
Ores
Petroleum
Precious Stones
Quartz and the Silicates
Useful websites
Hornblende picture
