Silkstone

Silkstone was a fibrous variety of quartz similar to tiger eye.

Description
This ornamental stone was found in many colors, yellow being the most common, and was cut cabochon, tumbled, or used for engravings such as seals for merchants and nobles. It exhibited faint highlights when light hit at certain angles. A typical stone had a base value of 10 gp.

Powers
Like tiger eye, silkstone was worn as a protection from spirits, though this was more old wives' tale than fact. However, shadows were known to hesitate briefly when encountering someone wearing a silkstone, perhaps giving them time to flee. This property also made powdered silkstone a viable substitute component when casting spells related to life-energy drain and the restoration of those effects. It was also used in the creation of magical inks needed to make scrolls of those spells.