Silkstone

Silkstone is a fibrous variety of quartz similar to tiger eye which has a faint sparkle. It is found in many colors, yellow being the most abundant, and is cut cabochon, tumbled, or used for engraved gems. Like tiger eye, silkstone is worn as a protection from spirits, though this is more old-wives'-tale than fact. A typical specimen has a base value of 10gp.