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5x7 mm / 0
An iron oxide-hydroxide mineral
Biotite is a name used for a large group of black mica minerals that are commonly found in igneous and metamorphic rocks
but unlike rubies
and this phenomenon is thought to be due to impurities of yttrium or organic matter within the crystal lattice
Amethyst 7x9-8x10mm Pebble A Grade - 15-16-Inch 18x25mm 5x7 mm / 0Amethyst 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