English chrysopal chrysoberyl chrysopal word

chrysopal gold emerald, also known as chrysoberyl. Chemical composition BeAl2O4, metal oxide crystalline mineral orthogonal (orthorhombic) crystal system. It ranked precious stones, having four variants: cat, Alexandrite, and cat alexandrite chrysoberyl crystal. Gold emerald itself is a relatively rare mineral, if they can cut into large particles and color clarity are good gems are very precious. Chrysoberyl usually better transparency, showing yellow or yellow-green, also was named. Most faceted gems are cut to show its excellent color of fire. Origin of Brazil, Sri Lanka and Madagascar. Market price is still low, because it has all the advantages of high-grade gems, and special color, so do not rule in time, when people understand it, the gem prices possible. Gold emerald beryllium and aluminum oxide, good quality, is extremely valuable. Chrysoberyl generally thick plate, a transparent glass shiny, different shades of green to yellow or brown, some will emit different colors under different light sources. Chrysoberyl mainly in granite pegmatite, aplite and mica schist, gravel is also found as detrital minerals. Because it is very hard wear, so there will in streams and gravel. Artificial ways to generate gold emerald, but the quality is not as good as natural. Chrysoberyl is an oxide, the main chemical ingredient is aluminum beryllium, chemical formula BeAl2O4. It belongs to the orthorhombic system. Crystalline form often has a short columnar shape. Color is brown, green, yellow, green, brown. Transparent to opaque. Glass to the oil sheen. Refractive index 1.746-1.755, 0.008-0.010 birefringence, dichroism significant dispersion 0.015. Hardness of 8.5, a density of 3.71-3.75 g / cc. Conchoidal fracture. Excellent toughness. Greenish-yellow chrysoberyl at short ultraviolet light, produce greenish yellow fluorescence. Case of acid from erosion. There are strange cat's eye or discoloration effect. Analogous to the spinel of the formula, it is also known beryllium spinel crystal structure but are similar to crystalline chrysolite (olivine). Crystal appearing thick plate; often form heart-shaped or pseudo-hexagonal twinned crystal through triple (see Figure). Good with cylindrical cleavage. Moss hardness 8.5, specific gravity of 3.63 to 3. 83. Transparent glass luster, or shallow or deep green to brown or yellow. Containing trace Cr3 + and green in daylight, red variant under candlelight, etc. in transmitted light and artificial light, called alexandrite, said Alexandrite gemstone industry in China. Another pale green and because it contains many microscopic voids and inclusions parallel to the needle and having a protein distribution in living light and light (see group mineral quartz) variant, is called cat's eye chrysoberyl, due mainly in Sri Lanka The cat's eye, also known as the East and Ceylon cat's eye. The world's leading gold emerald origin of Minas Gerais, Brazil, and Russia's Urals and Sri Lanka are the alexandrite green and gold opal famous origin. Chrysoberyl also synthesized by the flame fusion method, but as a gemstone material mass far less than the natural lens. Transparent crystal chrysoberyl, because hardness is precious stones. Tea color required as a pale yellow and brown as bright green-yellow, transparent, small flaw, the crystal diameter of greater than 3 millimeters in the art. After pondering, often collector's treasures. In the early 19th century, the American Museum of Natural History to get a man named "Hope" chrysoberyl, people praise it beautifully described as follows: "This rare gem, excellent transparency, sparkle, no spots and other blemishes. it's unusual huge particles, which are pretty flawlessly called unique in the world, it is rightly seen as a rare chrysoberyl