tombeads

The sapphire ingredient is the aluminum oxide, because of (Ti4+) or the iron (Fe2+) assumes the blue color including the trace element titanium. Is the trigonal system. Crystal shape Chang Chengtong the shape, short columnar, plate-type and so on, the geometric solid many are granular or compact massive.Mexican Agate Beads Transparently to translucent, glassy luster. the index of refraction 1.76-1.77, the double refraction rate 0.008, the dichroism is strong. Heterogeneous body. Sometimes has the special optical effect - star light effect. Degree of hardness is 9, density 3.95-4.1 grams/cubic centimeters. Does not have the cleavage, cracks the principle growth. Under certain condition, may produce beautifully six shoots the star light, is called " the star light sapphire ". [4] the sapphire may divide into the blue color sapphire and the colorful color (non-blue color) the sapphire. The color produces " the cornflower take India to be blue best " as. It is said the sapphire can protect king and the crowned head is exempt from the injury, has " the king stone " the name. The international gem decides as the sapphire " in September to be born the stone ", the symbolic affection, is loyal and is firm. The sapphire is world one of five big precious upscale gems. sapphire and similar blue color gem, synthesis blue color gem difference. Has the blue color spinel, the blue color alexandrite, the blue zircon, the benitoite, the kyanite, the cordierite with its similar blue color gem and so on. Has the synthesis sapphire, the synthesis spinel with its similar synthetic gem, to contain the cobalt glass. Blue color spinel: The color is homogeneous, the microstrip gray, the crystal assumes the octahedron body, the isotropic body, does not have the dichroism. Blue color alexandrite: Color for belt green blue color, crystal for duplicate tripartite columnar, degree of hardness, the density, the index of refraction compare the sapphire to be low, the dichroism is extremely obvious, the double refraction rate is big. Blue zircon: After the heating processing zircon,Cheap Beads the color is bright, chromatic dispersion, the double refraction rate is high. Synthesis sapphire: The color is homogeneous, pure, the inclusion is scarce, has the round air bubble, isotropic body.