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.
Read MoreIllinois State Mineral – Flourite
Fluorite melts at low temperatures and flows through other minerals, such as limestone, which is where it gets its name.
Read MoreGold, 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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