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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.
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.
Optical properties of common minerals Name Crystal system Indicatrix Optical sign Birefringence Color in plain polars Anorthite: Triclinic: Biaxial (-) 0.013
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 .
As of November 2024, the IMA - CNMNC List of Minerals lists 6,100 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 ...
Pages in category "Fluorine minerals" The following 41 pages are in this category, out of 41 total. This list may not reflect recent changes. A. Acuminite; Apophyllite;
Scheelite fluoresces under shortwave ultraviolet light, the mineral glows a bright sky-blue. The presence of molybdenum trace impurities occasionally results in a green glow. Fluorescence of scheelite, sometimes associated with native gold, is used by geologists in the search for gold deposits.
[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).