the English name for the Pearl Pernulo by Latin evolved

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Pearl, the English name for the Pearl Pernulo by Latin evolved. As early as in ancient times, when the original human on the beach, he found the grazing the viberating with color, and was it white pearls attracted the glittering and translucent magnificent, since when pearl became a favorite decorations, and circulates.

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Pearl is a kind of old organic gem, produces in the pearl shellfish and bead mother shellfish molluscs body, because the endocrine function containing calcium carbonate generated the minerals (/ or vaterites) bead is made of a number of tiny crystals set and/or vaterites in.

The chemical composition of pearl for: CaCO391.6 %, H2O and organic matter each 4%, other 0.4%. Pearl shape varied, circular, pear-shaped, egg-shaped, elongated, button shape and arbitrary shape, among them with circular is preferred. Inhomogeneous geological. Color have white, pink, pale yellow, pale green, pale blue, brown, lilac, black, is given priority to with white. White stripe. A typical pearly luster, soft gloss and color with rainbow sparkle. Transparent to translucent. Refractive index 1.686, double refractive index 1.530-0.156. Dispersion-free phenomenon. Hardness 2.5 1-4.5. The density of natural freshwater pearl for 2.66 - general 2.78 g/cm3, will vary by origin. No cleavage. Toughness is better. When the shortwave uv light pearl show white, flaxen, virescent, blue fluorescence, black pearl hair pink fluorescent; X-ray under have pale yellowish white fluorescent. Encounter hydrochloric acid blistering.

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With its warm, pearl, rich and graceful, always doted on for people, known as the jewelry queen. Pearl of ingredients that contain calcium carbonate, chemical stability mechanism of poor, soluble in acid, alkali, daily life is not suitable for contact perfume, oil, salt, alcohol, hair, vinegar and dirt; The more cannot contact XiangJiaoShui etc organic solvents; Summer, unfavorable also human sweat, need not when pearl necklace with senior neuter soap or the essence that wash clean, then gently dry in the sun exposure, not or roasted; Collect cannot put together with camphor ball, also do not for a long time in the bank insurance storehouse.

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