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Some fluorite, particularly the variety chlorophane (aka pyroemerald and cobra stone), may become very faintly luminescent simply from the heat of one's hand. Chlorophane is unusual for combining the properties of thermoluminescence, triboluminescence, phosphorescence, and fluorescence; it will emit visible spectrum light when rubbed, or ...
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.
Galena is the main ore of lead, used since ancient times, [6] since lead can be smelted from galena in an ordinary wood fire. [7] Galena typically is found in hydrothermal veins in association with sphalerite , marcasite , chalcopyrite , cerussite , anglesite , dolomite , calcite , quartz , barite , and fluorite .
Chlorophane, also sometimes known as pyroemerald, cobra stone, and pyrosmaragd, is a rare variety of the mineral fluorite with the unusual combined properties of thermoluminescence, thermophosphoresence, triboluminescence, and fluorescence: it will emit light in the visible spectrum when exposed to ultraviolet light, when heated, and when ...
The more general crystal structure describes materials of the type A 2 B 2 O 6 and A 2 B 2 O 7 where the A and B species are generally rare-earth or transition metal species; e.g. Y 2 Ti 2 O 7.The pyrochlore structure is a super structure derivative of the simple fluorite structure (AO 2 = A 4 O 8), where the A and B cations are ordered along ...
A range of terms are used to describe lustre, such as earthy, metallic, greasy, and silky. Similarly, the term vitreous (derived from the Latin for glass, vitrum) refers to a glassy lustre. A list of these terms is given below. Lustre varies over a wide continuum, and so there are no rigid boundaries between the different types of lustre.
Iridescent regional varieties, which are quite similar in composition and properties to belomorite, are naturally less common, but it would be wrong to call them rare minerals. Plagioclases with moonlight have long been known in some pegmatite veins of Shaitanka and Lipovka (Middle Urals ), as well as in Utochkina Pad near Ulan-Ude ( Buryatia ).
Blue, unbanded fluorite occurs in many localities around the world. Within the UK, blue fluorspars are also found in County Durham , especially Weardale . [ 1 ] : 39 Elsewhere, blue fluorspar is known in the Ardennes region of Belgium; the Cave-in-Rock area of Illinois in the United States; [ 1 ] : 39 and at various localities in Mexico and China.
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