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Cryptocrystalline

Having crystals so small that individual crystals cannot be seen under ordinary optical microscope, but are detectable by effect under crossed polars; a full rotation of a cryptocrystalline material between crossed polars will show the stone transmitting light in all positions. A good example of a cryptocrystalline material is chalcedony.

Early 20th Century Pin Centered with a Translucent Oval Cabochon Chrysoprase (Cryptocrystalline) Chalcedony.