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Topaz is a silicate mineral made of aluminum and fluorine with the chemical formula Al 2 Si O 4 (F, OH) 2.It is used as a gemstone in jewelry and other adornments. Common topaz in its natural state is colorless, though trace element impurities can make it pale blue or golden brown to yellow-orange. [7]
This is a list of gemstones, organized by species and types. Minerals ... Topaz; Tourmaline subgroup: Achroite (var.) Chrome ... Color (beta) Automatic. Light.
The irradiation process is widely practiced in jewelry industry [45] and enabled the creation of gemstone colors that do not exist or are extremely rare in nature. [46] However, particularly when done in a nuclear reactor, the processes can make gemstones radioactive. Health risks related to the residual radioactivity of the treated gemstones ...
Pleochroism is an extremely useful tool in mineralogy and gemology for mineral and gem identification, since the number of colors visible from different angles can identify the possible crystalline structure of a gemstone or mineral and therefore help to classify it. Minerals that are otherwise very similar often have very different pleochroic ...
Peridot is one of the few gemstones that occur in only one color: an olive-green. The intensity and tint of the green, however, depends on the percentage of iron in the crystal structure, so the color of individual peridot gems can vary from yellow, to olive, to brownish-green. In rare cases, peridot may have a medium-dark toned, pure green ...
Peridot, a gem-quality olivine; Archaically, any of several green or yellow-green-coloured gemstones including Topaz, a silicate mineral of aluminium and fluorine; Chrysoberyl, an aluminate of beryllium; Zircon, a mineral belonging to the group of nesosilicates; Prehnite, an inosilicate of calcium and aluminium
Astrology determines the gemstones most closely associated with and beneficial to a particular individual. For example, in Hinduism, there are nine gemstones related to the Navagraha (celestial forces including the planets, the Sun, and the Moon), known in Sanskrit as Navaratna (nine gems). At birth, an astrological chart is calculated.
Topaz is a semiprecious gemstone that occurs as very hard, transparent crystals in a variety of colors. It is naturally amber-colored, but becomes colorless after exposure to sunlight. Topaz forms within cavities of the volcanic rock rhyolite, from eruptions that occurred during the Tertiary Period six to seven million years ago. Topaz is ...
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