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Azurite or Azure spar [5]: 14 is a soft, deep-blue copper mineral produced by weathering of copper ore deposits. During the early 19th century, it was also known as chessylite , after the type locality at Chessy-les-Mines near Lyon , France . [ 3 ]
Azurite is a basic compound that is coordinated with copper. [1] Azurite was popular due to its stability in various light and atmospheric conditions, making it easy to store. [1] Although azurite is permanent in oil and tempura paint, it is darkened when exposed to sulfur; this can be seen in mural paintings that use azurite.
The modern English name of the mineral reflects this association, since both azurite and azure are derived via Arabic from the Persian lazhward (لاژورد), an area known for its deposits of another deep-blue stone, lapis. Azurite was often used in the Renaissance and later as a less expensive substitute for ultramarine. Lower layers would ...
A synthetic form of malachite, verditer, has also been used. In Latin America, the Teotihuacan civilisation, which ruled in Mexico between 300 and 650, AD, made murals using crushed malachite, which was mixed with chalk for lighter shades, or mixed with blue from azurite or lapis-lazuli to make blue greens, or with yellow ochre to make yellow ...
Azurmalachite is a mixture of azurite and malachite. [1] It is alternatively called azuromalachite, azurite-malachite and malachite-azurite. [2] Azurmalachite has a distinctive mottled green and blue coloration. It is relatively rare but can sometimes be found above copper deposits.
Rose-like crystal formation made of gypsum or baryte, often with sand grains included. They form in arid, sandy environments, typically through the evaporation of a shallow salt basin, and can ...
The sand leek is a perennial plant with an egg-shaped bulb. The plant produces two to five unstalked leaves, the bases of which are sheath-like. Each leaf blade is linear, 7–20 millimetres (1 ⁄ 4 – 3 ⁄ 4 in) wide, [10] flat with a slight keel, an entire margin and parallel veins. The edges of the leaf and the central vein are rough to ...
Diluted light blue, though, is used to describe the color of fine-textured Egyptian blue that has a large amount of glass formed in its composition, which masks the blue color, and gives it a diluted appearance. It depends on the level of alkali added to the mixture, so with more alkali, more glass formed, and the more diluted the appearance. [13]