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Diamond classification

  • Author:Sherry Huang
  • Source:www.boreway.net
  • Release on:2016-01-23

General classification

Diamond is carbon crystal under high temperature and pressure conditions is the hardest nature
mineral. Its name comes from the Greek "Adamas. ", Meaning unable to conquer the diamond is a rare and precious non-metallic mineral, plays an important role in the national economy diamond use is divided into two categories: high quality tablets can be used as decorations, said Gem diamond, fine for poor quality grain called industrial diamond industry.

Gem diamonds, also known as diamond, shiny bright, crystal clear, as the "king of gems", high value, is recognized worldwide as the first goods, the degree of their possession and consumption levels are often seen as a measure of individual and national economies affluence signs. Reach the gem diamond (industrial diamonds), with its ultra-rigid widely used in electronics, optics, construction, transportation, metallurgy, Geological Prospecting, defense and other industries and modern high and new technology.

Trace elements contained in the diamond can be divided according to type Ⅰ and type Ⅱ diamond diamond two types. Ⅰ type diamond mostly common ordinary diamond. Ⅱ type diamond is rare, accounting for only 1% to 2% of the total diamond. Type Ⅱ diamond because often have good thermal conductivity, cleavability and semiconductors, etc., are used for space technology and cutting-edge industries. A bluish color quality large grain type Ⅱ treasures diamond diamonds regarded as heavy 3 106ct (Carat, Carat) The world famous "Cullinan" diamond, is such a case.

Mineralogical classification

Class 1. Crystals with octahedral morphology, crystal surface smooth uniform, or with a stepped development features, but the growth plane is (111) plane, rarely observed over the (100) plane; crystals are transparent, they are not banded structure , mostly colorless, but a common light yellow; the nitrogen atom form a unit class isomorphous substituted carbon, having a central paramagnetic, as well as produce and income spectrum N3 Department, in particular, it determines the crystal yellow and blue luminous effect.

Class 2. The basic shape of a cube; crystals are transparent, not now banded structure; single atomic nitrogen impurities paramagnetic centers is relatively high, these centers are uniformly distributed throughout the crystal in the middle, often display yellow and orange photoluminescence.

Class 3. There are diamond-shaped crystal cubic and minority polyethylene, which is characterized by the formation of planar and irregular with the living body, and obey the law interludes from spinelDouble crystal; Crystal translucent, colorless or gray in varying degrees, or almost black opaque diamond, complex internal structure, the center has a colorless transparent zone, outside there are microscopic inclusions; the third category are crystal I type diamond, enriched nitrogen impurities, see the additional absorption bands in the infrared spectrum.

Class 4. It is known to have the shell of diamond, because the outer layer of the crystal is generally turbid milky white, light gray or stained with different degrees of yellow or green, and the kernel usually transparent crystals, crystals having the same characteristics of the first category, the colored The outer layer is often higher in nitrogen content of paramagnetic impurities.

Class 5. Dark or completely black diamond, its color depends on the crystal outer layer with a lot of raw graphite inclusions, the middle part of the crystal is transparent and colorless.

Class 6. Pellets diamond has a radial stripe structure, known as Balas, is a rare diamond in crystalline form, generally spherical completely regular, but there are drop-shaped or pear-shaped, most surfaces have a special pattern, Balas Have color, light gray and completely black, which also some white, colored protein.

Class 7. Liansheng body translucent diamond crystal, crystal itself is usually yellow, cracks and other defects from graphite inclusions translucent, consisting of the living body growth morphology of these crystals is octahedron.

Class 8. BelongBotClass, a large number of planes better, roughly the same size aggregates of small crystals. Even the shape of the total student body is oval or spherical, closed block Druse like small crystals. Different growth forms the living body composed of monomers octahedron, often stepped crystal surface structure, which resulted in the development of fake diamond dodecahedron.

9 class. Yizhu Bot class. Such whole grains Diamond Dan Liansheng body mass irregular lumps, they are composed of particles that are easy to distinguish, no regular crystal form, aggregate opaque, dark gray and black, sometimes uneven granular structure.

10 classes. Belongs to Ka Bangna multi-class, is hidden crystal or micro-crystals, with irregular blocky or chunky, usually more or less rounded shape edges, no bonding material, opaque with a variety of colors, usually, card Bonner multi-surface color is more important to some, and sometimes they are completely dark outside, but the interior is light in color.