birefraction
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birefraction — bi·refraction … English syllables
Heliotrope (mineral) — The mineral heliotrope, also known as bloodstone, is a form of chalcedony, which is a cryptocrystalline quartz. The classic bloodstone is green jasper with red inclusions of iron oxide (red jasper). Sometimes yellow and/or other colors of jasper… … Wikipedia
Conoscopic interference pattern — This page is about the geology/optical mineralogy term. For general information about interference, see Interference (wave propagation) or Interference patterns. A conoscopic interference pattern or interference figure is the best way to… … Wikipedia
