Amethyst Tumbled Gemstones from Brazil - 20-40 mm - 1 LB. LOT Menu Fossils & Amber Carnelian is a variety of

Carnelian is a variety of chalcedony that derives its color from large amounts of iron oxide

Obsidian is not a gemstone

the latter taking its color from tiny inclusions of fluid or gas while it is formed

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Agate Slice #4  1-KILO  4"-4

Amethyst Tumbled Gemstones from Brazil - 20-40 mm - 1 LB. LOT Menu Fossils & Amber Carnelian is a variety ofQuantity: 1 pound Pieces measure approximately 20 40 millimeters. Amethyst is a violet gemstone that occurs when quartz containing significant iron impurities and other trace elements undergoes natural geological irradiation over long periods of time, altering the color. Variations in color occur based on the amount of iron and the specific trace elements present in the original quartz.