Pearl composition and characteristics

The English name of the pearl is Pearl, which evolved from the Latin Pernulo. As early as in ancient times, when primitive humans were foraging on the beach, they discovered a white pearl with black halo, and it was attracted by its crystal and magnificence. Since then, pearl has become a favorite accessory and has been passed down to the present.

Pearl is an ancient organic gemstone produced in pearl shellfish and mother-of-pearl mollusks. The calcium carbonate-containing mineral (aragonite) beads produced by endocrine function are composed of a large number of tiny aragonite crystals. of.

The chemical composition of the pearl is: CaCO391.6% H2O and organic matter 4% each, and other 0.4% pearls are various in shape, and have a round shape, a pear shape, an egg shape, a teardrop shape, a button shape, and an arbitrary shape. The circle is better. Heterogeneous. The colors are white, pink, light yellow, light green, light blue, brown, lavender, black, etc., mainly white. Red streak. It has a typical pearl luster with a soft luster and a rainbow glow. Transparent to translucent. The refractive index of 1.5301.686 birefringence 0.156 has no dispersion phenomenon. Hardness 2.54.5 The density of natural freshwater pearls is generally 2.662.78g/cm3 depending on the place of origin. No clerk. Good toughness. Under short-wave ultraviolet light, the pearls are white, light yellow, light green, and blue, and the black pearls are reddish fluorescent; there are yellowish white fluorescence under X-rays. Foaming with hydrochloric acid.

Pearl is known as the Queen of Jewelry for its warmth, elegance, and magnificence. The composition of pearls is calcium carbonate containing mechanism. It has poor chemical stability, is soluble in acid and alkali, and is not suitable for contact with perfume, oil, salt, alcohol, hair cream, vinegar and dirt in daily life. Organic solvents; in summer, people sweat more, and should not wear pearl necklaces. When not in use, wash them with high-grade neutral soap or detergent, then dry them. Do not expose them to the sun or bake them in the sun; Put it together, and don't put it in the bank's safe warehouse for a long time. The hardness of the pearl is low. Wearing a long red pearl will be yellow, so that the gloss is worse, can be bleached with 1% -1.5% hydrogen peroxide, be careful not to drift over the head, otherwise it will lose its luster.

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