A form of Macrocrystalline quartz (meaning the crystals are recognizable with the naked eye), it is found in Brazil, India, China and Japan. Most Aventurine is reddish brown to yellow with shimmering metallic particles called mica throughout the stone. If there are any red or brown particles in Aventurine, it is caused by hematite platelets. Some specimens of true green have also been found naturally, but most green, blue and red gems on the market have been dyed. Aventurine is said to bring peace and promote positive attitude, confidence and tranquility