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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 was frequently used in European Renaissance painting. It appears, for example, in the dark blue sky of a Spanish altarpiece painting by Bartolome Bermejo. [8] In this painting, azurite is also combined with lead white to paint the green robe of the Saint. [8] During this time, azurite was a common pigment used to paint a blue sky. [1]
3) 2 (OH) 2, a blue crystalline solid also known as the mineral azurite. It too has been used as pigment, sometimes under the name mountain blue or blue verditer. Both malachite and azurite can be found in the verdigris patina that is found on weathered brass, bronze, and copper. The composition of the patina can vary, in a maritime environment ...
Bisbee, Arizona, 92 miles southeast of Tucson experienced secondary oxidation and enrichment to form high-quality malachite and azurite. Southern Arizona was uplifted and experienced volcanic eruptions, which deposited high silica ash to the north as the Chinle Formation , which created the petrified wood of Petrified Forest National Park .
Traditionally, Chinese pigments come in form of chips, cakes or powder made from natural plant and minerals. Some of these require preparation by adding glue (明膠) before they can be used. Traditional pigments require some skill and knowledge to mix as some pigments do not blend well with others (e.g. herbal and stone colours generally do ...
Image credits: Ross Burgener Meanwhile, for Dr. Brandon, the most beautiful natural phenomenon is the northern lights, whereas the most fascinating is the diel vertical migration.
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.
The blues is a popular musical form created in the United States in the 19th century by African-American musicians, based on African musical roots. [92] It usually expresses sadness and melancholy. A blue note is a musical note sung or played at a slightly lower pitch than the major scale for expressive purposes, giving it a slightly melancholy ...