Emeralds: It is one of the types of metal beryl beryl if the income is structurally chromium Cr component, and takes the composition formula [Cr- [Be3Al2 (Si6O18), crystallized in the form of prisms hexagonal, and rehearse the green light when the net, and other colors in the case of a bug in it , characterized by severely 7.5- 8 and the weight of the two types of 2.63- 2.93, unaffected by acids. Beautiful types: Emerald net (green color), aquamarine Aquamarine (bluish green), Hiluodor heliodor (golden color), Morganat morganite (pink). Used bad types of Beryl, which is not suitable for the gems in the extraction of beryllium Be alloys used in the aircraft industry and spacecraft (Alchukl- 4). 6. turquoise (or turquoise) turquoise: It takes formula CuAl6 [po4] 4.4H2O, and has a light blue, but some impurities gain gradations of color green mixed, available in nature in the form of crystals of non-engineering (three-mile triclinic) or in the form of blocks monolith hidden gelling, cruelty 5-6, specific gravity of 2.8, using the net and good varieties after teaching them the desired shape jewels for decoration and the most expensive is a heavy blue species (Fig. 5). 7. lapis lazuli lazurite: chemical composition Na6Ca (SO4, Cl, S) 2 (AlSiO4), there is in the form of crystals cuboidal or twelve decimal rhombic faces, enjoy the color dark blue or sky blue or purple or blue-green, cruelty 5. 5.5, density 2.4, glassy luster, unaffected by acids, used large crystals with net colors in the formulation of essences and invests most fragile quantities in the manufacture of dyes (Alchukl- 6). 8. topaz topaz: installation chemical Al2 [SiO4] (F, OH) 2, the crystallization of the system rhombic straight orthorhombic system, color is variable: yellow, smoky, green, blue, pink, red, unaffected by acids except fluorine, is one of the gems job in the jewelry industry.
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