Garnet, a hard, transparent or semi-transparent mineral occurring as crystals, as grains, or in irregular masses. Garnets are silicates in combination with iron, calcium, manganese, magnesium, aluminum, or chromium. Most of the gem garnets —pyrope, almandite, spessartite, andradite, uvarovite, and grossularite—are reddish in color, but some are greenish, yellowish, or white. The garnet is the birthstone for January and represents constancy. Common garnets are used as watch jewels (bearings), as abrasives, and in coating sandpaper.
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Petrified Wood, wood that has been fossilized by being turned into stone. Petrifaction is a natural process that may form fossils from the solid remains of any plant or animal.