What is a pearl

pearl basic information Category Minerals Chemical formula CaCO3 nature

Color: white, pink, silver, cream, brown, green, blue, black, yellow, color

Cleavage Hardness :2.5–4.5 Streak: white Proportion: 2.60–2.85

Dispersion rate Luminescence is weak and cannot be assessed.

Pearl, or pearl, is a hard, sleek product produced by mollusks (mainly oysters). Pearls are commonly used in the jewelry and treasure industries.

The unique luster of pearls is caused by the reflection and diffraction of light on these transparent nacre layers. The thinner the permacarpic layer, the more beautiful the gloss. The fluorescence of some pearls is formed by the constant refraction of incident light by different bead layers. The average pearl is white, sometimes with a beige or pink sheen, and some pearls have a yellow, green, blue, brown or black color. Black pearls are expensive because of their rarity.

Pearls are mainly the products of some scorpion mollusks.These animal-specific epithelial cells secrete calcium carbonate, mainly aragonite and calcite bound together by shell hard proteins. This mixture is called pearly. The causes of pearls are: the injury of the coat and the carapace, when the pearl is secreted as a wound and secreted to the wound.The artificial pearl is injected with a nacre of nucleus surrounded by a layer of external epithelium. The pearls secreted by these animals range from months to years. Large grained pearl formation is likely to be fatal to the animal.





In addition to the use of pearl mites, there are also methods of producing pearls using mollusc species with bead layers in other shells. For example, some of the gastropod species such as abalone and snail can be used.