Geological Time Scale
Iron Hill Pluton
Date Collected: 08/01/2007
Acquired by: Field Collection
Iron Hill Park
New Castle County
Limonite is a type of iron-rich mineral found in igneous formations. It was once used as a source of iron ore and in Delaware was mined for the purpose for two centuries. Limonite tends to form with vugs of easily-weathered minerals, including druse quartz, which leave behind gaping holes and slots. It is easy to picture skulls and other bones in these rocks, whether freshly fractured or stream-worn. This one always reminded me of a dragon skull.
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