Может быть whetstone. Вероятность небольшая, но всё же. Вот тут есть боевичёк старинный, может оно:Hrungnir shoved the shield beneath his feet and stood on it, and held the whetstone with both hands. Next he saw lightnings and heard great thunders. Then he saw Thor in an As-rage, he was travelling at an enormous rate and swung his hammer and threw it from a great distance at Hrungnir. Hrungnir raised the whetstone with both hands, threw it in return. It met the hammer in flight, the whetstone, and the whetstone broke in two. One piece fell to the ground, and from it have come all whetstone rocks. The other piece flew into Thor's head so that he fell forwards to the ground, but the hammer Miollnir hit the middle of Hrungnir's head and shattered his skull into small fragments, and he fell forwards over Thor so that his leg lay across Thor's neck
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