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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.
Collections include petrified wood, various fossils, fluorescent minerals, meteorites, zeolites, and a variety of other minerals. With more than 20,000 specimens, the museum is the largest of its kind in the Pacific Northwest. The facility has around 25,000 visitors each year.
Fluorite (also called fluorspar) is the mineral form of calcium fluoride, CaF 2. It belongs to the halide minerals. It crystallizes in isometric cubic habit, although octahedral and more complex isometric forms are not uncommon. The Mohs scale of mineral hardness, based on scratch hardness comparison, defines value 4 as fluorite. [6]
A large variety of secondary uranium minerals are known, many of which are brilliantly coloured and fluorescent. The most common are gummite (a mixture of minerals), [7] autunite (with calcium), saleeite and torbernite (with copper); and hydrated uranium silicates such as coffinite, uranophane (with calcium) and sklodowskite (magnesium).
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.
A particular mineral species (e.g. calcite, quartz, fluorite) or mineral group (zeolites, phosphate minerals) to show the variety within the species/group. A particular geological formation, such as minerals found in pegmatites. Fluorescent minerals. Radioactive minerals. Twinned crystals.
Franklin Furnace ca. 1900 Fluorescent minerals of the Franklin mineral district: franklinite (black), willemite (green), and calcite (red). USGS. Franklin Furnace, also known as the Franklin Mine, is a famous mineral location for rare zinc, [1] iron, and manganese minerals in old mines in Franklin, Sussex County, New Jersey, United States.
Autunite (hydrated calcium uranyl phosphate), with formula Ca(UO 2) 2 (PO 4) 2 ·10–12H 2 O, is a yellow-greenish fluorescent phosphate mineral with a hardness of 2– 2 + 1 ⁄ 2. [4] [5] Autunite crystallizes in the orthorhombic system and often occurs as tabular square crystals, commonly in small crusts or in fan-like masses.
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