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Luminescence occurs in some minerals when they are exposed to low-powered sources of ultraviolet or infrared electromagnetic radiation (for example, portable UV lamps), at atmospheric pressure and atmospheric temperatures. This property of these minerals can be used during the process of mineral identification at rock outcrops in the field.
This is a list of minerals which have Wikipedia articles. Minerals are distinguished by various chemical and physical properties. Differences in chemical composition and crystal structure distinguish the various species .
Fluorescent minerals emit visible light when exposed to ultraviolet. Fluorescent marine organisms Fluorescent clothes used in black light theater production, Prague Fluorescence is one of two kinds of photoluminescence , the emission of light by a substance that has absorbed light or other electromagnetic radiation .
Agrellite displays pink fluorescence strongly under shortwave and weakly under longwave ultraviolet light. [5] [6] The fluorescent activator is dominantly Mn 2+, with minor Eu 2+, Sm 3+, and Dy 3+. [6] It is named in honor of Stuart Olof Agrell (1913–1996), a British mineralogist at Cambridge University.
Optical properties of common minerals Name Crystal system Indicatrix Optical sign Birefringence Color in plain polars Anorthite: Triclinic: Biaxial (-) 0.013
As of January 2025, the IMA - CNMNC List of Minerals lists 6,118 valid minerals, including 1,153 pre-IMA minerals (grandfathered), and 97 questionable minerals. [2] Also as of November 2024 [update] , the Mineralogical Society of America's Handbook of Mineralogy lists 5,663 species, [ 3 ] and the IMA Database of Mineral Properties/RRUFF Project ...
[citation needed] The Mormon Book of Ether describes "sixteen small stones; and they were white and clear, even as transparent glass", being touched by God's hand so that they might "shine forth in darkness." The Jaredites placed a stone fore and aft on each ship and had "light continually" during their 344-day voyage to America (Ball 1938: 500).
At its type locality, franklinite can be found with a wide array of minerals, many of which are fluorescent. More commonly, it occurs with willemite, calcite, and zincite. In these rocks, it forms as disseminated small black crystals with their octahedral faces visible at times. It may rarely be found as a single large euhedral crystal.
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