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Rarely, it can be found as neon green or electric blue. Tourmaline ( / ˈtʊərməlɪn, - ˌliːn / TOOR-mə-lin, -leen) is a crystalline silicate mineral group in which boron is compounded with elements such as aluminium, iron, magnesium, sodium, lithium, or potassium. This gemstone comes in a wide variety of colors.
Rubellite is the red or pink variety of tourmaline and is a member of elbaite. Rubellite is also the rarest gem in its family. [2] It is occasionally mistaken for ruby. [3] These gems typically contain inclusions. [4] Notable countries where rubellite can be mined include Afghanistan, Brazil, Madagascar, Myanmar, Nigeria, Russia, and the United ...
Prasiolite (also known as green quartz, green amethyst or vermarine) is a green variety of quartz. Since 1950, almost all natural prasiolite has come from a small Brazilian mine, [citation needed] but it has also been mined in the Lower Silesia region of Poland. Naturally occurring prasiolite has also been found in the Thunder Bay area of ...
Gallery. Howlite, as collected, southern California. A polished mass showing veining. Form of howlite crystals from Iona, Nova Scotia. Form of howlite crystals from Tick Canyon, California. Howlite artificially colored in blue, and sold under the name turquenite. Howlite and Silver Bolo tie with small inclusions of tiny, brownish howlite crystals.
Lepidolite is a phyllosilicate mineral [ 5] and a member of the polylithionite-trilithionite series. [ 6] Lepidolite is part of a three-part series consisting of polylithionite, lepidolite, and trilithionite. All three minerals share similar properties and are caused because of varying ratios of lithium and aluminum in their chemical formulas.
Topaz is a gemstone. In cut and polished form, it is used to make jewelry or other adornments. Lower quality topaz is commonly used as an abrasive material due to its hardness and it is used to produce refractory materials for high temperature environments. [ 7] Topaz can be used as a flux in steel production. [ 23]
Flint. Flint, occasionally flintstone, is a sedimentary cryptocrystalline form of the mineral quartz, [ 1][ 2] categorized as the variety of chert that occurs in chalk or marly limestone. Historically, flint was widely used to make stone tools and start fires . Flint occurs chiefly as nodules and masses in sedimentary rocks, such as chalks and ...
West is the lead author of a new study recently published in the journal BMJ Public Health that found that getting between 7 and 9 hours of sleep each night was optimal for brain health. The ...