pearls: a solids spherical or oval-shaped, composed of calcium carbonate and organic materials called Balkounkeulen Concioline, be Hjovernma with 5-12 mm dimensions, enjoying smooth surfaces shiny psoriasis private Ptolqat under the sun's rays. Pearls extracted from objects pluteaceae freely from bivalve molluscs affiliated to. Characterized by varying densities and Ksawat depending on the proportions of calcium carbonate and organic adhesive conchiolin. Colored pearls of varying colors, depending on the installation of central water in which they live oysters are being donated celestial colors or green or orange or purple or black. The pink pearls are formed by manganese Mn-rich water of the most expensive types of colored pearls. The extraction of pearls Mharadtha be soft, and to harden were placed in the mouth for two hours but today are fed in a private Mahmat then on the wet fabrics, treated after Baldlk surfaces to become brighter and brighter. 12. amber amber: a gum was produced extinct fossilized conifers, which flourished in the third round Tertiary geological trees. The organic material Agrockerbonih and formula C40H64O4, marks on the shores of some of the sea in the form of spherical or oval or shapeless blocks, with yellow colors yellow or reddish or yellowish smoke, amber is characterized by a lack of cruelty It is easy to cut and carved and polished and get him the desired shapes. Density 02/01 to 10/01, bad transportation of electricity but it Atkahrb when itchy woolen cloth, unrelenting temperature of 150 Celsius degree burns at 250-400 generates smell. It is one of the gems that address to give precious jewels, especially ones containing some insects preserved (Fig -9). It should be noted here not to confuse the Latin word amber and the word «Amber» in Arabic, which is a material with the appearance of gray organic waxy lightweight and are formed in the intestines of the type of whale sperm whale and graduated vomiting, and found on the shores of tropical seas. Amber is used in perfumes and incense industry and offset the Latin word ambergris.
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