Frost agate

Frost Agate or frost stone, is an agate with white frost-like appearance over the base color. It is rare, and is usually tumbled and polished to a beautiful glassy finish. A master lapidarist can cut the fragile stone in facets so that at each point where facets meet (such as in a polyhedron cut, the shape of a d20), a "snowflake" of white "frost" appears. Frost agates are often enchanted to be luckstones. Low quality stones are treated like other agates, powdered for use in draughts and potions. A typical stone has a base value of 10gp.