Ophealine

Ophealine is the name in the Realms for axinite, also called "glass stone" or, if violet in hue, "yanolite". It is commonly brown in color--such a vivid brown that large crystals appear almost opaque. Ophealine is cut in facets, and although not possessing one of the most attractive gemstone hues, it can yield finished gemstones of considerable size, both hard and durable. On the streets of Waterdeep, such gems were once known as "knuckle stones"; when polished and mounted on rings, their sharp edges have laid open many a noble's or thief's face at many a drunken party. A typical specimen has a base value of 10gp.