Sunstone (gem)

Sunstone, also known as oligoclase, was a feldspar gem closely related to moonstone.

Description
This ornamental stone could be colorless or faintly greenish and of facet grade, but most common by far was its softer (cabochon) variety. This rarely yielded gemstones more than three-quarters of an inch (2 centimeters) in diameter, and had bright red or orange spangles (minute crystals) suspended in a nearly colorless background in a parallel fashion, giving the whole a rich golden or reddish brown color. A typical stone had a base value of 10 gp.

Powers
Sunstones could be made into talismans, usually in the form of jewelry, that acted on undead just like full sunlight. A sunstone talisman must be charged by being left in full sun for at least one day (about six hours of continuous exposure). Thereafter, the talisman could be worn and would remain dormant until the wearer was successfully attacked (physically touched) by an undead creature. If the undead attacker was affected by sunlight, it would: Undead not harmed by light (skeletons, mummies, and liches for example) were completely immune to a sunstone talisman. Ghosts were forced into a semi-material state. Vampires took actual damage but cannot be slain by a sunstone talisman alone. Only the detached head and entrails of a penanggalan were susceptible to sunstone talisman effects.
 * recoil in fear or pain for a few minutes
 * be easier to hit as it turned away from the talisman
 * be unable to use abilities such as regeneration, energy drain, chilling touch, etc.

Sunstones were also used in the casting of the druid spell sunray.