Amethyst 10x8mm Faceted Butterfly A Grade - 15-16 Inch R0717 Hematite within the stone is

Hematite within the stone is responsible for its reddish and rusty colors

cacoxenite

it is a form of hydrated amorphous silica

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Amethyst 10x8mm Faceted Butterfly A Grade - 15-16 Inch R0717 Hematite within the stone isAmethyst is a beautiful purple stone, known as a Gem of Fire by ancient cultures. It has been greatly sought after throughout history and was at times valued as highly as Diamond. Today, this semi to precious variety of quartz is found in many locations around the world. The presence of Manganese within the stone produces the purple hue, and variation of the amount of iron in the stone creates a color range from reddish purple to deep violet to light