(1) natural condensation, free from outside interference and the formation of crystals have neat regular geometric shape, from the range of the crystal. (2) has a fixed melting point of the crystal, in the melting process, the temperature of the crystal remains unchanged. (3) crystal has anisotropic characteristics. (4) X-ray crystal can occur regularly diffraction. X-ray diffraction can produce macroscopic phenomena, the experiment is to determine a substance is not a crystal structure of the particles and their forces can be divided into four categories: from TEM images look crystal structure crystal, atomic crystals, molecular crystals and metal crystals. The solid can be divided into crystals, amorphous and semi-crystalline three categories. Geometry with a neat rules, fixed melting point and anisotropic solid material, is a basic form of material existence. Solid material is crystalline, usually by X-ray diffraction to be identified. The crystal structure of the particles (atoms, ions, molecules, radicals) are regularly repeated periodically in three-dimensional space are arranged to form a certain form of the lattice, the shape of the performance of a certain shape geometry polyhedron. Geometric polyhedron composed of a plane called the crystal surface. Yue Crystal Materials Co., Ltd. Shandong days, due to the different growth conditions, the crystals may be somewhat skewed in shape, but among the same kind of crystal crystal plane angle (crystal plane angle) is certainly called crystal plane angle invariance principle. Its internal crystal structure can be divided into seven crystal systems and 14 kinds of lattice type. Synthetic single crystal bismuth crystal has a certain symmetry, there are 32 kinds of symmetry elements of the Department, and the corresponding action group called symmetric crystal system point group. According to the different nature of the forces between particles inside the crystal can be divided into ionic crystals, atomic crystals, molecular crystals, metal crystals, and other four typical crystal, such as salt, diamond, ice and various metals. There are differences between the same crystal single crystal and polycrystalline (or rose quartz) is. Also has a mixed crystal in practice. Speaking of crystal, have talked about from crystals. We know that all matter is made of atoms or molecules. Shandong days Yue is well known, the material gathered in three forms: gas, liquid and solid crystals of the main methods. [1] (5) corresponding to the crystal planes of equal angles, called crystal plane angle conserved. Crystalline material is popular, few sites in this regard, even if there is not very professional, very easy to exchange, please recommend some highly specialized crystalline materials site, I know there are the following, there is a home page Introduction Yue Crystal Materials Co., Ltd. Shandong days, as follows: China crystal material is related to the crystal mesh material professional integrated international portal of several crystals by senior industry experts co-founded, the specific contents include: nonlinear optical crystal, laser crystal, IR crystals, piezoelectric crystals, crystal La Man Laman displacement, scintillation crystal, pyroelectric crystals, electro-optical crystal, crystal terahertz, THz crystals, semiconductor crystals, crystal composite function, since doubling crystal, optical superlattice crystals, doubling crystal, organic crystals, soft crystals, biological crystals, metal single crystal thin film crystals, quartz, semi-metallic organic nonlinear optical crystal, etc., to effectively "promote the development of crystalline materials industry, active academic atmosphere crystal industry" carbonized silicon, Chinese crystal material network station model breaks the traditional academic sites and industry sites, in addition to building a professional crystal materials industry database, but also to build the industry group, the Friends of crystal micro-Bo, Help Forum, Jobs and other interactive am strong columns, favored by the majority of workers in crystalline materials. Shandong days Yue crystal materials, silicon carbide (certified), Jinan, Shandong days Yue provided by Spark Technology Development Company Limited. Jinan Spark Technology Development Co., Ltd. (www.sicc.cc) is a leader in Jinan, chemical equipment, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Jinan Spark leadership with the staff warmly welcome all inquiries negotiations to create a better future for Jinan Spark.