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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.
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 .
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.
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.
Willemite is a zinc silicate mineral (Zn 2 Si O 4) and a minor ore of zinc.It is highly fluorescent (green) under shortwave ultraviolet light. It occurs in a variety of colors in daylight, in fibrous masses and apple-green gemmy masses.
Synthetic crystals can be colorless or can range in color from dark red, orange, or yellow to light green. Synthetic zincite crystals Both natural and synthetic zincite crystals are significant for their early use as semiconductor crystal detectors in the early development of crystal radios before the advent of vacuum tubes.
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.
Agardite is a mineral group consisting of agardite-(Y), [4] [5] agardite-(Ce), [6] agardite-(Nd), [7] and agardite-(La). [8] They comprise a group of minerals that are hydrous hydrated arsenates of rare-earth elements (REE) and copper, with the general chemical formula (REE,Ca)Cu 6 (AsO 4) 3 (OH) 6 ·3H 2 O. Yttrium, cerium, neodymium, lanthanum, as well as trace to minor amounts of other REEs ...