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Haüyne or prismatic azure spar is a transparent or translucent mineral, similar to lazurite, in composition sodium and calcium aluminosilicate with the ideal formula (Na,Ca) 4-8 Al 6 Si 6 (O,S) 24 (SO 4,Cl) 1-2 having a blue or blue color, sometimes with a greenish tint, [5] was also known among the azure spars.
Lazurite is a pigment (opalescent) and has a bright blue streak (especially as a component of the semiprecious stone lapis lazuli). Many hauynes have a white or pale blue streak and are translucent. Many hauynes have a white or pale blue streak and are translucent.
Originating from the Persian word for the gem, lāžward, [1] lapis lazuli is a rock composed primarily of the minerals lazurite, pyrite and calcite. As early as the 7th millennium BC, lapis lazuli was mined in the Sar-i Sang mines, [2] in Shortugai, and in other mines in Badakhshan province in modern northeast Afghanistan. [3]
Lapis lazuli (the pigment ultramarine) was chiefly supplied from Afghanistan during the Middle Ages, whereas azurite was a common mineral in Europe at the time. Sizable deposits were found near Lyons, France. It was mined since the 12th century in Saxony, in the silver mines located there. [17]
Another Sar-e Sang Lazurite crystal, with the classic deep azure-blue color. Crystal is 4.5 cm wide. Sar-i Sang (or Sar-e Sang) (lit. "stone summit" in Persian) is a settlement in the Kuran Wa Munjan District of Badakhshan Province, Afghanistan, famous for its ancient lapis lazuli mines producing the world's finest lapis. [1]
Size: 2.4 cm × 1.7 cm × 0.8 cm (0.94 in × 0.67 in × 0.31 in). Lazulite forms by high-grade metamorphism of silica -rich rocks and in pegmatites . It occurs in association with quartz , andalusite , rutile , kyanite , corundum , muscovite , pyrophyllite , dumortierite , wagnerite , svanbergite , trolleite , and berlinite in metamorphic ...
It is mainly used for the production of blue jeans. [1] It is also used as a food colorant, and is listed in the United States as FD&C Blue No. 2. Maya blue is a synthetic turquoise -blue pigment made by infusing indigo pigments (particularly those derived from the anil shrub) into palygorskite , a clay that binds and stabilises the indigo such ...
In 1735, the French chemist Charles François de Cisternay du Fay determined that lapis lazuli, emerald, and aquamarine were luminescent. Josiah Wedgwood, in 1792, found phosphoresce from rubbing together two pieces of quartz or of agate, and wrote that the ruby gives "a beautiful red light of short continuance."