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Tahitian pearl. Tahitian pearls in bulk. The Tahitian pearl (or black pearl) is an organic gem formed from the black lip oyster ( Pinctada margaritifera ). [1] These pearls derive their name from the fact that they are primarily cultivated around the islands of French Polynesia, around Tahiti. [2]
A snake-stone, also known as a viper's stone, snake's pearl, black stone, serpent-stone, or nagamani is an animal bone or stone used as folk medicine for snake bite in Africa, South America, India and Asia. The early Celtic era European adder stone is also called a snake stone, and is usually made from coloured glass, often with holes. Its ...
Keshi pearls are small non-nucleated pearls typically formed as by-products of pearl cultivation. A Japanese word also meaning "poppy" (ケシ, 芥子), it is used in Japanese for all pearls that grew without a nucleus. Originally, keshi pearls referred to those pearls formed when a bead nucleus was rejected. More recently, keshi has been used ...
Nacre. Nacre ( / ˈneɪkər / NAY-kər, also / ˈnækrə / NAK-rə ), [1] also known as mother of pearl, is an organic–inorganic composite material produced by some molluscs as an inner shell layer. It is also the material of which pearls are composed. It is strong, resilient, and iridescent .
The modern chrysolite is a green oblong hexagonal prism of unequal sides terminated by two triangular pyramids. Topaz, or ancient chrysolite, is an octangular prism of an orange-yellow colour; it is composed of alumina, silica, hydrofluoric acid, and iron. it is found in Ceylon, Arabia, and Egypt.
Jade. Jade is an umbrella term for two different types of decorative rocks used for jewelry or ornaments. Jade is often referred to by either of two different silicate mineral names: nephrite (a silicate of calcium and magnesium in the amphibole group of minerals), or jadeite (a silicate of sodium and aluminum in the pyroxene group of minerals ...
AMBER is used to minimize the bond stretching energy of this ethane molecule. Assisted Model Building with Energy Refinement ( AMBER) is the name of a widely-used molecular dynamics software package originally developed by Peter Kollman 's group at the University of California, San Francisco. It has also, subsequently, come to designate a ...
The first involves a black crane; according to legend, when a crane has lived a thousand years it turns blue; after another thousand it becomes black and is called a xuanhe (玄鶴. "dark crane"). Kuai Shen [噲參] was the most filial son to his mother. Once a black crane was injured by a bow hunter and in its extremity, went to Kuai.