Lazurite is a blue-colored mineral. Another name is Lapis Lazuli. But only uniformly colored dark blue varieties of lapis lazuli are called so. This stone has been known since ancient times. Its name "lapis lazuli" came into use in the 18th century. May contain golden inclusions of pyrite and white inclusions of albite. These golden blotches were mistaken for gold in ancient times, which increased the value of the stone. Pliny in 70 AD compared golden inclusions in lapis lazuli with flashes of lightning in a gloomy sky.
Lapis lazuli crystals are very rare. Usually this mineral occurs in the form of dense masses. The highest quality lapis lazuli is mined in Afghanistan (Badakhshan province). Lapis lazuli is also found in Russia - in Transbaikalia.
Badakhshan lapis lazuli is so valuable that its mining in the mountains of Afghanistan is the second most important source of funding for the Taliban. According to A.E. Fersman, lapis lazuli is classified as an ornamental stone of the first order. In ancient times, it was supplied to Europe from Persia, where it was considered a royal stone. Only noble people could possess it, and it was traditionally given to the bride for the wedding. If such a gift was made by a commoner, the punishment for his possession of lapis lazuli was the death penalty.
Based on lapis lazuli, blue pigments for painting were made. In ancient Egypt, it was believed that this stone establishes a connection with the gods.
You can see lazurite stone for sale and buy it in the Minerals of Russia online store.
General | |
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Category | Tectosilicate |
Formula (repeating unit) |
(Na,Ca)8[(S,Cl,SO4,OH)2|(Al6Si6O24)] |
IMA symbol | Lzr |
Strunz classification | 9.FB.10 |
Crystal system | Isometric |
Crystal class | Hextetrahedral (43m) H-M symbol: (4 3m) |
Space group | P43n |
Unit cell | a = 9.09 Å; Z = 2 |
Identification | |
Color | Deep blue, azure, violet-blue, greenish blue |
Crystal habit | Crystals occur as dodecahedra, or rarely cubes; granular, disseminated, or massive |
Cleavage | Imperfect on {110} |
Fracture | Uneven |
Tenacity | Brittle |
Mohs scale hardness | 5–5.5 |
Luster | Vitreous |
Diaphaneity | Translucent to opaque |
Specific gravity | 2.38–2.45 |
Optical properties | Isotropic; anomalously anisotropic |
Refractive index | 1.502–1.522 |
Fusibility | 3.5 |
Solubility | Soluble in HCl |