Large well-formed crystals of garnet have been found in cavities in metamorphosed Triassic conglomerate in York County, Pennsylvania, 6 miles southeast of Harrisburg. The garnets were formed by contact metamorphism of intrusive diabase. The rounded cavities were produced by the solution of limestone pebbles in the conglomerate, and the the calcium of the limestone combined with silica and iron oxide to formgarnet. A small amount of hematite is also present in the cavities.

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