Fluorite (likely)

Hardness: 4 on Mohs scale. Color: Highly variable, often green, purple, blue, yellow, pink, or colorless. The beads in the image appear to be light green, purple, and colorless/clear. Luster: Vitreous (glassy). Crystal Structure: Isometric (typically forms cubic, octahedral, or dodecahedral crystals). Cleavage: Perfect octahedral cleavage in four directions, which can sometimes be seen as internal fractures or step-like surfaces. Specific Gravity: 3.18. Often fluorescent under UV light.

Fluorite commonly forms in hydrothermal veins, where hot, mineral-rich fluids circulate through cracks and fissures in rocks. It can also be found in sedimentary rocks, especially limestones and dolomites, as a gangue mineral in ore deposits (e.g., lead, zinc), and in pegmatites. Its formation age varies widely depending on the geological setting, ranging from Precambrian to Cenozoic.

Uses: Significant industrial mineral. Used as a flux in steelmaking to lower the melting point of raw materials. Essential in the production of hydrofluoric acid for various chemical processes, including the manufacture of refrigerants, Teflon, and aluminum. Optical grade fluorite is used for special lenses in telescopes and cameras due to its low dispersion and excellent light transmission. Jewelry: While relatively soft for everyday wear, fluorite is popular for ornamental carvings, beads (as seen in the image), and cabochons. Its diverse colors make it attractive to collectors.

Fluorite's name comes from the Latin word 'fluere,' meaning "to flow," referring to its use as a flux. It was also the origin of the term 'fluorescence' because many fluorite specimens exhibit this phenomenon under ultraviolet light. It's known for its incredibly wide range of colors, often occurring in distinct color zones within a single crystal. Some fluorite can also be phosphorescent (glows after the light source is removed) or thermoluminescent (glows when heated).

How to identify in the field: Can be identified by its relative softness (scratches easily with a knife, but not a fingernail), its perfect octahedral cleavage (if crystals are present), and often by its distinctive colors and vitreous luster. If possible, a UV light can confirm fluorescence. Common locations: Significant deposits are found worldwide, including China (currently the largest producer), Mexico, Mongolia, South Africa, Russia, and several states in the USA (e.g., Illinois, Kentucky, New Mexico, Colorado). Tips for collectors: Due to its softness and perfect cleavage, fluorite specimens can be fragile and should be handled with care. Raw crystals are highly sought after for their perfect forms and vibrant colors. The beads in the image, with their translucent appearance and varied light coloration (greenish, purplish, clear), are very characteristic of fluorite.