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Quartz crystal demonstrating transparency. Pure quartz, traditionally called rock crystal or clear quartz, is colorless and transparent or translucent and has often been used for hardstone carvings, such as the Lothair Crystal. Common colored varieties include citrine, rose quartz, amethyst, smoky quartz, milky quartz, and others. [33]
Crystal is a transparent mineral resembling glass, most probably a variety of quartz. Job places it in the same category with gold, onyx, sapphire, glass, coral, topaz, etc. The Targum renders the qrt of Ezech. as "ice"; the other versions translate it as "crystal". Crystal is again mentioned in Apoc., iv, 6; xxi, 11; xxii, 1.
Gemstone. Group of precious and semiprecious stones—both uncut and faceted—including (clockwise from top left) diamond, uncut synthetic sapphire, ruby, uncut emerald, and amethyst crystal cluster. A gemstone (also called a fine gem, jewel, precious stone, semiprecious stone, or simply gem) is a piece of mineral crystal which, when cut or ...
In particular, there are crystals that have trigonal symmetry but belong to the hexagonal lattice (such as α-quartz). The hexagonal crystal family consists of the 12 point groups such that at least one of their space groups has the hexagonal lattice as underlying lattice, and is the union of the hexagonal crystal system and the trigonal ...
Morganite (gem) Morganite is an orange or pink variety of beryl and is also a gemstone. [2] Morganite is mined in Brazil, Afghanistan, Mozambique, Namibia, the United States, and Madagascar. [3] Morganite has grown in popularity since 2010. [2] Brides and CNN have listed it as a possible alternative to diamond for engagement rings. [4][5]
Crystal. Crystals of amethyst quartz. Microscopically, a single crystal has atoms in a near-perfect periodic arrangement; a polycrystal is composed of many microscopic crystals (called "crystallites" or "grains"); and an amorphous solid (such as glass) has no periodic arrangement even microscopically. A crystal or crystalline solid is a solid ...
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