Corundum is a crystalline form of aluminium oxide (Al2O3) with traces of iron, titanium and chromium. It is a rock-forming mineral. It is one of the naturally clear transparent materials, but can have different colors when impurities are present. Transparent specimens are used as gems, called ruby if red and padparadscha if pink-orange. All other colors are called sapphire, e.g., "green sapphire" for a green specimen
DRYHEAD AGATE from Montana. Silverhawk's designer gemstones. This bright and well patterned beauty features fortification banding and a few orbs in shades of reddish-orange, pink and several peach chiffon pastels.