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Gem-quality form of olivine; indicator of volcanic activity; confused with emeralds; can have tones of yellow or dark green
Type of chalcedony; often forms in veins between a matrix of light, sandy stone; can be bright or dark green; derived from the Greek words 'chrysos' ("golden") and 'prason' ("leek")
amphibole silicate mineral with fine, needle-like crystals; previously known as 'prase; derived from Greek work 'aktis' ("ray"), due to the fibrous nature.
Commonly found in S. Africa; discovered by Colonel Hendrick von Prehn; usually seen as radiating masses or botryoidal
Common variety of massive quartz; has fine, sparking inclusions; color varients can be red-brown or blue; in Tibet it was believed to increase perception
Precious gem; variety of beryl; common among royalty
Has red, brown, or yellow markings created by iron oxides; known in antiquity as 'Heliotrope'; may be classified as a Jasper or Chalcedony - usually a combo of both; treasured by some as a talisman of good health; one legend says it was formed by the crucifixion of Jesus christ
Often forms green, cloudy inclusions within quartz crystals; has a form called 'Seraphinite'; very soft stone with a hardness of 2; can be from pale and dark green to black