Frystalline: This mineral grows in the icy mountain caves of Eronia, the second layer of the Blessed Fields of Elysium. Its resilient, pale-gold crystals contain divine energy that emanates from a god that sleeps beneath the mountains. Any weapon made of frystalline is treated as good-aligned for the purpose of overcoming damage reduction. The market price modifier for such a weapon is +2,000 gp.
Frystalline has 15 hp per inch of thickness and hardness 10.

Source: Book of Exalted Deeds

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