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Name: EVT
Address: 9 Hàng Chuối, Phạm Đình Hổ, Hai Bà Trưng, Hà Nội, Hà Nội, 100000, VN
Telephone: 0946951353
Price range: 100000

EVT.VN 11 năm trước 1643 lượt xem

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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.		Diamond Garnet Rhodolite Spinel
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.		Zircon
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:		Aquamarine Benitoite Beryl Emerald Heliodor Morganite
Trigonal Again, the trigonal system is a subsystem of the hexagonal. Most gem references will list these as hexagonal.		Amethyst Citrine Corundum Ruby Sapphire Tourmaline Eudialyte Quartz
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.		Alexandrite Andalusite Chrysoberyl Iolite Peridot Tanzanite Topaz Varisite
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.		Azurite Diopside Feldspar Kunzite Nephrite
Triclinic In this system all the axes are different lengths and none of them meet at 90°.		Turquoise