113 results for fluorite

Fluorite is a calcium fluoride crystal with a hardness of 4. Fluorite has a perfect cleavage (meaning it will break easily along a flat plane). It forms in massive, cubes, or isometric crystals and...

For many rock collectors it is not about beauty, or rarity, or location.  Fluorescence is about how that rock or mineral looks under a UV light.  Some ordinary and often ugly rocks actually glow (or a

Kentucky may not have lots of rocks and minerals, but it has lots of fossils. Long ago Kentucky was covered in shallow tropical seas, so brachiopod, coral, sponge, crinoid, trilobite, and nautiloid...

Tiffany Stone, also called Bertrandite, is a unique purple semiprecious stone material from Utah. It is actually an Opalized Fluorite, or an Opalite (yes, there is a such a thing as...

Illinois is not known for producing many gemstones or minerals. But Illinois was the leading producer of fluorite in the United States for many years, and the mineral was named the official state...

Colorado, like most western states, has produced gold, copper, and silver. Gold was discovered in 1859 and the most productive gold mine in Colorado, the Cresson Mine, produced more than 258,000...

Tennessee has more mineral resources than any other state east of the Mississippi, except North Carolina. Limestone and dolomite, bituminous coal, lead, zinc, ball clay, sand and gravel, phosphate,...

Sagenite Agate, or Sagenitic Agate, is any agate having acicular or needle-like mineral or crystal growths. These "sagenites" usually intersect in a grid or grill-like pattern, but the hair...

Washington's Petrified Woods are some of the finest in the nation. <

New Hampshire has a large variety of rocks and minerals. This is due mostly to the pegmatites that comprise a large portion of New Hampshire's surface. The igneous and metamorphic rocks were worn...