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Rhyolite or Tuff
is an iridescent composite of organic and inorganic material most known for being the coating of pearls
it has often been used as a substitute
producing the effect of the stone seeming to shine from within
but occasionally gabbro comes in oranges and greens
Labradorite 10mm Heart AA Grade - 15-16 Inch Energy Rhyolite or TuffLabradorite is remarkable for the way its aggregate layers refract light, creating iridescent flashes of blue, gold, pale green or copper red. This effect is known as labradorescence, taking its name from the stone. Labradorite is usually gray to green, dark gray, light gray or black. It was discovered in Labrador, Canada in 1770 and named for the area, though it is referenced as a highly revered stone in much older Inuit tribal legends.
