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- Chrysoberyl abstract "The mineral or gemstone chrysoberyl is an aluminate of beryllium with the formula BeAl2O4. The name chrysoberyl is derived from the Greek words χρυσός chrysos and βήρυλλος beryllos, meaning "a gold-white spar". Despite the similarity of their names, chrysoberyl and beryl are two completely different gemstones. Chrysoberyl is the third-hardest frequently encountered natural gemstone and lies at 8.5 on the hardness scale, between corundum (9) and topaz (8).An interesting feature of its crystals are the cyclic twins called trillings. These twinned crystals have a hexagonal appearance, but are the result of a triplet of twins with each "twin" oriented at 120° to its neighbors and taking up 120° of the cyclic trilling. If only two of the three possible twin orientations are present, a "V"-shaped twin results.Ordinary chrysoberyl is yellowish-green and transparent to translucent. When the mineral exhibits good pale green to yellow color and is transparent, then it is used as a gemstone. The three main varieties of chrysoberyl are: ordinary yellow-to-green chrysoberyl, cat's eye or cymophane, and alexandrite. Yellow-green chrysoberyl was referred to as "chrysolite" during the Victorian and Edwardian eras, which caused confusion since that name has also been used for the mineral olivine ("peridot" as a gemstone); that name is no longer used in the gemological nomenclature.Alexandrite, a strongly pleochroic (trichroic) gem, will exhibit emerald green, red and orange-yellow colors depending on viewing direction in partially polarised light. However, its most distinctive property is that it also changes color in artificial (tungsten/halogen) light compared to daylight. The color change from red to green is due to strong absorption of light in a narrow yellow portion of the spectrum, while allowing large bands of blue-greener and red wavelengths to be transmitted. Which of these prevails to give the perceived hue depends on the spectral balance of the illumination. Fine-quality alexandrite has a green to bluish-green color in daylight (relatively blue illumination of high color temperature), changing to a red to purplish-red color in incandescent light (relatively yellow illumination). However, fine-color material is extremely rare. Less-desirable stones may have daylight colors of yellowish-green and incandescent colors of brownish red.Cymophane is popularly known as "cat's eye". This variety exhibits pleasing chatoyancy or opalescence that reminds one of an eye of a cat. When cut to produce a cabochon, the mineral forms a light-green specimen with a silky band of light extending across the surface of the stone.".
- Chrysoberyl thumbnail Chrysoberyl-282796.jpg?width=300.
- Chrysoberyl wikiPageID "49976".
- Chrysoberyl wikiPageRevisionID "605556884".
- Chrysoberyl 2v "Measured: 70°".
- Chrysoberyl category Oxide_minerals.
- Chrysoberyl cleavage "Distinct on , imperfect on , poor on {001}".
- Chrysoberyl color "Various shades of green, yellow, brownish to greenish black, may be raspberry-red under incandescent light when chromian; colorless, pale shades of yellow, green, or red in transmitted light".
- Chrysoberyl formula "BeAl2O4".
- Chrysoberyl fracture "Conchoidal to uneven".
- Chrysoberyl gravity "3.5".
- Chrysoberyl habit "Crystals tabular or short prismatic, prominently striated".
- Chrysoberyl hasPhotoCollection Chrysoberyl.
- Chrysoberyl luster "Vitreous".
- Chrysoberyl mohs "8.5".
- Chrysoberyl name "Chrysoberyl".
- Chrysoberyl opticalprop "Biaxial".
- Chrysoberyl pleochroism "X = red; Y = yellow-orange; Z = emerald-green".
- Chrysoberyl refractive "nα=1.745 nβ=1.748 nγ=1.754".
- Chrysoberyl streak "White".
- Chrysoberyl strunz "4".
- Chrysoberyl symmetry "Orthorhombic 2/m2/m2/m dipyramidal".
- Chrysoberyl system Orthorhombic_crystal_system.
- Chrysoberyl tenacity "Brittle".
- Chrysoberyl twinning "Contact and penetration twins common, often repeated forming rosette structures".
- Chrysoberyl unitCell "a = 5.481 Å, b = 9.415 Å, c = 4.428 Å; Z = 8".
- Chrysoberyl var "Alexandrite".
- Chrysoberyl var "Cymophane".
- Chrysoberyl var1text "Color change; green to red".
- Chrysoberyl var2text "Chatoyant".
- Chrysoberyl wordnet_type synset-mineral-noun-1.
- Chrysoberyl subject Category:Aluminium_minerals.
- Chrysoberyl subject Category:Beryllium_minerals.
- Chrysoberyl subject Category:Gemstones.
- Chrysoberyl subject Category:Orthorhombic_minerals.
- Chrysoberyl subject Category:Oxide_minerals.
- Chrysoberyl type ChemicalSubstance.
- Chrysoberyl type Mineral.
- Chrysoberyl type ChemicalObject.
- Chrysoberyl type Thing.
- Chrysoberyl comment "The mineral or gemstone chrysoberyl is an aluminate of beryllium with the formula BeAl2O4. The name chrysoberyl is derived from the Greek words χρυσός chrysos and βήρυλλος beryllos, meaning "a gold-white spar". Despite the similarity of their names, chrysoberyl and beryl are two completely different gemstones.".
- Chrysoberyl label "Chrysoberil".
- Chrysoberyl label "Chrysoberyl".
- Chrysoberyl label "Chrysoberyll".
- Chrysoberyl label "Chrysobéryl".
- Chrysoberyl label "Chryzoberyl".
- Chrysoberyl label "Crisoberillo".
- Chrysoberyl label "Crisoberilo".
- Chrysoberyl label "Crisoberilo".
- Chrysoberyl label "Хризоберилл".
- Chrysoberyl label "كريسوبيريل".
- Chrysoberyl label "金緑石".
- Chrysoberyl sameAs Chryzoberyl.
- Chrysoberyl sameAs Chrysoberyll.
- Chrysoberyl sameAs Χρυσοβήρυλλος.
- Chrysoberyl sameAs Crisoberilo.
- Chrysoberyl sameAs Chrysobéryl.
- Chrysoberyl sameAs Crisoberillo.
- Chrysoberyl sameAs 金緑石.
- Chrysoberyl sameAs 금록석.
- Chrysoberyl sameAs Chrysoberil.
- Chrysoberyl sameAs Chryzoberyl.
- Chrysoberyl sameAs Crisoberilo.
- Chrysoberyl sameAs m.0d80_.
- Chrysoberyl sameAs Q422179.
- Chrysoberyl sameAs Q422179.
- Chrysoberyl wasDerivedFrom Chrysoberyl?oldid=605556884.
- Chrysoberyl depiction Chrysoberyl-282796.jpg.
- Chrysoberyl isPrimaryTopicOf Chrysoberyl.
- Chrysoberyl name "Chrysoberyl".