Phosphorescent Fluorite - El Potosi #11 Popular Crystals_Pyrite in which the Calcite matrix

in which the Calcite matrix is gradually dissolved to reveal the fascinating structure of the Chalcedony underneath

due to the absence of the typical amounts of iron and manganese that are usually present

Lithium Quartz is generally thought of as being coloured pink by the presence of Lithium inclusions within the crystals

Blue Calcite with Graphite from Spitzkoppe

Phosphorescent Fluorite - El Potosi #11 Popular Crystals_Pyrite in which the Calcite matrixThis 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