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Tinh thể Ststems

EVT.VN 10 năm trước 1468 lượt xem

     Tinh thể Ststems

    Cubic
    The cube is composed of 6 square faces at 90 degree angles to each other. Each face intersects one of the crystallographic axes and is parallel to the other two.

    cubic

    diamondDiamond
    garnetGarnet 
    rhodoliteRhodolite 
    spinelSpinel

    Tetragonal

    The tetragonal system also has three axes that all meet at 90°. It differs from the isometric system in that the C axis is longer than the A and B axis which are the same length.

    tetragonal

    zirconZircon

    Hexagonal

    In the hexagonal system we have an additional axes, which gives the crystals six sides. Three of these are equal in length and meet at 60° to each other. The C or vertical axis is at 90° to the shorter axes.
    Mineralogists sometimes divide this into two systems, the hexagonal and the trigonal, based on their external appearance, as follows:

    hexagonal

    Trigonal

    Again, the trigonal system is a subsystem of the hexagonal. Most gem references will list these as hexagonal.

    trigonal

    amethystAmethyst
    citrineCitrine 
    corundumCorundum 
    rubyRuby 
    sapphireSapphire 
    tourmalineTourmaline
    eudialite Eudialyte
    quartzQuartz 

    Orthorhombic

    In this system there are three axes, all of which meet at 90° to each other. However, all the axes are a different length.

    orthorhombic

    Monoclinic

    . The above crystal systems all have axes sides that meet at 90°. In the monoclinic system all the axes are different lengths. Two of them, the A and C axes, meet at 90°, but the third one does not.

    monoclinic

    Triclinic

    In this system all the axes are different lengths and none of them meet at 90°.

    triclinic

    turquoiseTurquoise