Detection of diamond and diamond jewelry

From the diamond crystal structure and crystal morphology types, as well as diamond physical, chemical parameters, such as crystal loss, including body composition, after the cut characteristics, discussed the formation of diamond and diamond (Diamond) identification methods, enumerated with Diamond (Diamond) similar to the distinction between precious stones.
1, diamond type crystal structure and morphology
1.1 The diamond crystal structure
Diamond is a senior grain group minerals, symmetric to 3L44L366L29PC, in accordance with the symmetrical characteristics of analysis, should hexahedron (6), octahedron (8), rhombic dodecahedron (12), triangular three octahedral (24), square 3 octahedral (24), 46 sided (24), 6 octahedron (48) 7 and by the Simplex Simplex Poly-shaped form appears in the kimberlite has also been a low of 64 symmetric plane for the 3L344L36P body (24) Simplex (Figure 1).
Crystal lattice structure of space by Blavy two of fcc lattice of parallel stacked column (Fig. 2). Crystal frame formed by the tetrahedron of fcc structure, each tetrahedron center and the four vertices of the carbon atoms are closely linked by covalent bond, due to a saturation of covalent and directional, so combined with very hard, close .
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Diamond crystal structure constant -
Chemical composition: C; crystal system: isometric crystal system; symmetric 3L44L366L29PC; space group O7h = Fd3m Z = 8; unit cell: a = 3.56A6.
1.2 The type of diamond crystal form
Kimberlite, lamproite in the crystal form is divided into single-crystal diamond, with two types of crystal, crystal about 60%. Crystal by crystal form into flat, curved crystal, flat - surface crystals. With about 40% of the crystal by crystal form with students divided into pairs of crystal with crystal, crystal with students.
1.2.1 Single Crystal
1.2.1.1 Crystallographic
Flat crystal is a crystal without ablation, according to Blavy rule: the density of crystal face should be composed of a larger surface net, so kimberlite, lamproite in the standard diamond crystal is octahedral plane, However, magma physical, chemical conditions change, there will be (111) growth of inconsistency, which resulted in different crystal forms.
Tube in the rock crystal plane of the total amount of 70% dikes in 20% of the total amount. diamond diamond.yifei8.net
(1) Flat octahedron: a stable phase within the diamond into the phase, expansion phase of the basic crystalline phase diamond shape. Kimberlites in the octahedral plane reservations diamond, diamond-phase expansion phase is the crystallization of the product.
Octahedral plane by a surface level, eight straight edge surface composition, crystal surface angle of 109 ° 28 14 ", and 70 ° 31 46", crystal planes are triangular, quadrilateral, pentagon, hexagon, angles of 60 ° ; or 120 °, as additional crystal growth edge, so that there are 18 kinds of octahedral crystal form, cite 4 in Figure 3.
Ladder octahedron is the growth of diamond shape, in the octahedral plane (111) surface, growth layers appear triangular ladder, due to increase in step density, (111) is gradually reduced, and gradually replace the crystal step edges, forming fake diamond dodecahedron (Figure 4).
A large number of ladder-like formation of octahedral diamond phase in the expansion phase of diamond rock cylinder phase, accounting for 85% of the crystal surface, this phenomenon illustrates the existence of diamond phase expansion phase of diamond growth conditions to continue, but time constraints due to crystallization, crystal General Growth is not. Ladder characteristic octahedral crystals are not subjected to magmatic rounded ability, but there is still loss as production planes.
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(2) the hexahedron: diamond phase expansion phase is reduced as the temperature is not conducive to the formation of octahedral elected, mainly in the phase kimberlite dykes.
Hexahedral diamond-shaped crystal leaving it smooth, rough planes Kimberlite.
(3) Flat octahedron (ladder-like octahedral) 16-sided poly-shaped: As the expansion phase of diamond with temperature, pressure, unstable changes to form a hexahedral-based poly-shaped crystal (Fig. 5) and in octahedral-based polymer shaped crystal (Fig. 6).
1.2.1.2 Surface Crystal
Surface ablation shaped crystal is a crystal, when the kimberlite magma from the inside into the stable phase into the invasive stage, when stimulated in the rounded form. Diamond (110) things to mesh density and the first ablation, this is because the surface density of the crystal face large, must face away from the major gateway for the sake of easily damaged, (111) face masks greater density, However, due to (111) two-level control of network structure, the first level, second level network protection network, the (111) plane is the role of diamonds in the ablation area in the most stable network. diamond diamond.yifei8.net
Role in the ablation process, the crystal edges, vertices and magmatism than planes, so ablation greater than crystal face, which, as only two vertices connected with the crystal key, magma ablation greater than the three key link in the crystal and crystal edges.

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