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Many in nature, and emerald green transparent gemstones similar species, the more common emerald, tourmaline, fluorite, peridot, garnet and zircon, which looks exactly like the emerald is confusingly tourmaline, fluorite and emerald . To the naked eye, generally radiate translucent green jade, often interwoven fibers porphyritic texture, and quality emeralds transparent crystal. Emerald hardness of 7.5-8, while low fluorite hardness of only four. Emerald smaller proportion, while the proportion of fluorite, tourmaline, emerald are larger. Zircon is strong and has a significant dispersion double shadow.
Chrysoberyl containing beryllium aluminum oxide, th [url=http://www.tiffanyoutlet-2014.com]tiffany co[/url]e chemical formula BeAl2O4. Belongs to orthorhombic. Crystal morphology often has short columnar or plate. Opal has a variety of colors, such as honey yellow, brown and yellow, wine, yellow, brown, green, brown, gray-green, of which the most valuable honey yellow. Transparent to translucent. Glass to the oil sheen. Refractive index 1.746-1.755, 0.008-0.010 birefringence. Dichroism obvious, dispersion 0.015, non-homogeneous body. Hardness of 8.5, a density of 3.71-3.75 g / cc. Conchoidal fracture.
Recognition method is that, after injection opal candied or significantly different specific gravity in the water test, the specific gravity lighter. Can also be used to test the heated needle injection opal, natural opal not into hot needle injection Opal able plunging an [url=http://www.tiffanyoutlet-2014.com]tiffany jewelry[/url]d produce molten plastic odor after.
Natural crystal clear, often contain cloudy, star-shaped or floc-liquid inclusions, and tend to have micro-cracks. In addition, there is a natural crystal polarizing seen twins phenomena, such as the crystal sphere, from the look down, met with a double shadow phenomenon. Synthetic crystal or glass products, pure homogeneous body, no cracks, internal tend to have small bubbles. Look down from the sphere, see the following lines of double vision. Recognition by hand, you can feel the proportion is greater than the synthetic crystal natural crystal [url=http://www.tiffanyoutlet-2014.com]tiffany & co[/url]; natural crystal of feeling cold, and glass have warm feeling.
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