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					Diamond
Diamond Introduction
1. Mineral name "diamond", English for the Diamond, from
ancient Greek Adamant, meaning hard physical inviolability, is recognized as the king
of gemstones. Diamond's chemical composition has 99.98% of carbon. In
other words, the diamond is actually a very high density of carbon crystals.

2. Diamond hardness: 10, is the highest natural mineral hardness. But do not believe
that the high hardness of diamonds, it never damaged. In fact, diamonds are also very
high brittle, hard collision will fracture.

3. Is based on its original stone diamond shape, to cut into various shapes of diamonds.
Among the eight welcomed by the shape: round, oval, rugby tapered, heart, pear,
square, triangular and Beryl shape. Round diamond, is the most common shape.

4. Diamond is a natural mineral. The main origin of diamonds is Australia, South
Africa, India; the United States, India, Israel, Belgium is the diamond processing base
for cutting. Particularly in Belgium, is a recognized carved diamond trading center.
?Chemical composition
Chemical composition of the diamond is carbon, which is the only gem composed of
a single element. An equiaxed crystal. Duocheng octahedral crystal form, rhombic
dodecahedron, tetrahedron and their poly-shaped. Pure colorless diamonds, because of
trace elements in mixed and presented in different colors. Strong adamantine luster.
Refractive index 2.417, dispersion medium, 0.044. Homogeneous body. Thermal
conductivity of 0.35 card / cm ? sec ? °. Thermal conductivity meter test, the reaction
is most sensitive. Hardness of 10, is the hardest known mineral, the absolute hardness
is 1000 times of quartz, corundum 150 times, fear of blows, blows will break along its
cleavage. A cleavage completely. Density of 3.52 g / cc. Diamond has the luminous
nature of sunlight, the night light cyan phosphor can be issued. X-ray irradiation,
given sky-blue fluorescence. Chemical properties of diamonds is very stable at room
temperature is not easy to dissolve in acid and alkali, acid and alkali will not on its
effect.

Similar to the diamond and precious stones, synthetic diamond distinction. Substitute
for the market common gem or imitation gem with colorless, colorless spinel, cubic
zirconia, strontium titanate, yttrium aluminum garnet, yttrium gallium garnet,
synthetic rutile. Synthetic diamonds in 1955, first developed by Japan, but not mass
production. Because the synthetic diamond than the high cost of natural diamonds,
synthetic diamonds on the market so rarely. Diamond with its characteristic hardness,
density, dispersion, refractive index difference can be similar to his gem. Such as:
Fangzuan cubic zirconia and more colorless, strong dispersion (0.060), strong luster,
density, 5.8 g / cubic centimeter, a sense of obvious heavy hand Dian. Yttriu

				
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