Delaware State Mineral – Sillimanite
In 1977, the Delaware General Assembly, acting on a proposal by the Delaware Mineralogical Society, established sillimanite as the Delaware State Mineral.
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Illinois State Mineral – Flourite
Fluorite melts at low temperatures and flows through other minerals, such as limestone, which is where it gets its name.
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Gold, California State Mineral
The accidental discovery of gold in 1848 at Sutter’s Mill in Coloma started a bonanza that brought California fame and gave it the...
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