Phosphorescent Fluorite - El Potosi #13 halloween are formed from either gypsum

are formed from either gypsum or baryte mixed with sand inclusions that get lodged in during the evaporation process that forms the crystal

we bought these directly from the miner in St Marie who pulled them out of the pocket in the ground over 30 years ago

Watermelon Tourmaline is another popular variety

Red streaks of Hematite can also be seen in the tip

This lovely Baryte cluster from Huanaco

Phosphorescent Fluorite - El Potosi #13 halloween are formed from either gypsumThis very new find Fluorite from December 2025 comes from the El Potosi Mine in Mexico. It has an unusual shape for Fluorite, and the current theory is that these may in fact be pseudomorphs after Calcite. They display not only fluorescence in longwave 365nm light, but also phosphorescence, which depending on the piece, can last several seconds after the UV light is turned off (this is best viewed in complete darkness). You will receive the exact