fluorite

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Picnic Point, Washington (Wikipedia) Picnic Point is a census-designated place (CDP) located in Snohomish County, Washington. The population was 8,809 at the 2010 census. It was formerly part of the Picnic Point-North Lynnwood CDP.

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In 1852, fluorite gave its name to the phenomenon of fluorescence, which is prominent in fluorites from certain locations, due to certain impurities in the crystal.

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calcium fluoride
mineral

Wikidata

https://www.wikidata.org/wiki/Q102151

Wikipedia

Fluorite (Wikipedia) Fluorite (also called fluorspar) is the mineral form of calcium fluoride, CaF2. It belongs to the halide minerals. It crystallizes in isometric cubic habit, although octahedral and more complex isometric forms are not uncommon.