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Ruby, Al?O?, a mineral, a type of corundum, belongs to the class of oxides, trigonal syngony, red gemstone. Wikipedia
02/10/2022

Ruby, Al?O?, a mineral, a type of corundum, belongs to the class of oxides, trigonal syngony, red gemstone. Wikipedia

A sapphire is a gemstone of different hues, one of the varieties of corundum. In mineralogy, a sapphire is a colored cor...
02/10/2022

A sapphire is a gemstone of different hues, one of the varieties of corundum. In mineralogy, a sapphire is a colored corundum, while in jewelry any color except lilac-red. The blue color of a sapphire is caused by the presence of titanium and iron impurities.

Alexandrite is a natural variety of the mineral chrysoberyl with an admixture of chromium. It was first described in 184...
01/10/2022

Alexandrite is a natural variety of the mineral chrysoberyl with an admixture of chromium. It was first described in 1842. It differs from other, as a rule, yellowish-green chrysoberyls by its strong pleochroism.

Pearl - a mineraloid, a biogenic solid, rounded or irregular shaped formation, extracted from the shells of some marine ...
30/09/2022

Pearl - a mineraloid, a biogenic solid, rounded or irregular shaped formation, extracted from the shells of some marine and river mollusks. The formation of pearls is a protective reaction of the mollusk body to any foreign body caught in the mantle or between the mantle and the shell.

Opal is a mineraloid, SiO?-nH?O amorphous silica, widely used in jewelry.
29/09/2022

Opal is a mineraloid, SiO?-nH?O amorphous silica, widely used in jewelry.

The garnet is a precious mineral with a deep red color. It has been known to mankind since the earliest civilizations, b...
28/09/2022

The garnet is a precious mineral with a deep red color. It has been known to mankind since the earliest civilizations, but was especially popular in the Middle Ages. Its rich scarlet color symbolized power, passion, and the very energy of life.

Topaz is a semi-precious stone, a mineral of the group of basic aluminum silicates. It crystallizes in rhombic syngony, ...
28/09/2022

Topaz is a semi-precious stone, a mineral of the group of basic aluminum silicates. It crystallizes in rhombic syngony, rhombo-biramidal type of symmetry.

Moonstone is a relatively rare mineral of the potassium feldspar group, a type of low-temperature orthoclase. It is name...
27/09/2022

Moonstone is a relatively rare mineral of the potassium feldspar group, a type of low-temperature orthoclase. It is named for its shining blue iridescence, which is caused by its thin-plate structure.

27/09/2022

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