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Fluellite

Namesake comes from the composition as being a fluate, or fluoride, of alumine, which is “alum” in Latin, and “alumina” in French. Uncommon to rare secondary phosphate occuring in pegmatites and phosphorite deposits. Crystals nearly identical from each deposit as colorless orthorhombic dipyramids with pinacoidal faces. Notable occurences are Hagendorf pegmatite, Willard mine, Nevada and South Rasmussen mine, Idaho. other localities for Fluellite include in England, Germany, the Czech Republic, Belgium, Italy, Australia, Argentina, Kazakhstan, and here in the Black Hills of South Dakota at the Barker-Ferguson mine among other USA localities. Fluellite can fluoresce a cream to white color under long-wave ultraviolet light.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/fluellite.pdf

Fluorapatite

Named for the dominance of fluorine in the composition and as a member of the apatite group. Fluorapatite is a common mineral that can be found as fine crystals in Germany, Austria, Portugal, Afghanistan, Pakistan, Brazil, Mexico, the United States, Canada, Russia, South Africa, and Australia. It is the most common rock-forming phosphate mineral and is an accessory in most igneous rocks. It can be found in syenites, alkaline rocks, carbonatites, granite pegmatites, marbles, skarn, metamorphic rocks, Alpine-type fissures, hydrothermal tin veins, sedimentary phosphorites, as a detrital or diagenetic mineral in oolitic ironstones and carbonate rocks and shales, and in residual amounts in laterites. Typically found as light to deep purple, hexagonal, prismatic crystals. Uncommonly with pyramidal terminations. Colors, size of crystal, and crystal habits are usually different for each geological environment in which apatite occurs. Fluorapatite can be cathodoluminescent, phosphorescent, or fluorescent under ultraviolet light.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/fluorapatite.pdf

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