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Malachite is a copper carbonate hydroxide mineral, with the formula Cu 2 CO 3 (OH) 2.This opaque, green-banded mineral crystallizes in the monoclinic crystal system, and most often forms botryoidal, fibrous, or stalagmitic masses, in fractures and deep, underground spaces, where the water table and hydrothermal fluids provide the means for chemical precipitation.
Both malachite and azurite, as well as synthetic basic copper carbonate have been used as pigments. [10] One example of the use of both azurite and its artificial form blue verditer [11] is the portrait of the family of Balthasar Gerbier by Peter Paul Rubens. [12]
Malachite is a copper carbonate hydroxide mineral, with the formula Cu 2 CO 3 (OH) 2. This opaque, green-banded mineral crystallizes in the monoclinic crystal system , and most often forms botryoidal , fibrous, or stalagmitic masses, in fractures and deep, underground spaces, where the water table and hydrothermal fluids provide the means for ...
Malachite green is also used in endospore staining, since it can directly stain endospores within bacterial cells; here a safranin counterstain is often used. Malachite green is a part of Alexander's pollen stain. Malachite green can also be used as a saturable absorber in dye lasers, or as a pH indicator between pH 0.2–1.8. However, this use ...
In 1960, C. W. F. T. Pistorius claimed synthesis by heating basic copper carbonate at 180 °C in an atmosphere of carbon dioxide (450 atm) and water (50 atm) for 36 hours. The bulk of the products was well-crystallized malachite Cu 2 CO 3 (OH) 2, but a small yield of a rhombohedral substance was also obtained, claimed to be CuCO 3. [6]
Copper(II) hydroxide is the hydroxide of copper with the chemical formula of Cu(OH) 2.It is a pale greenish blue or bluish green solid. Some forms of copper(II) hydroxide are sold as "stabilized" copper(II) hydroxide, although they likely consist of a mixture of copper(II) carbonate and hydroxide.
Above the water table the environment is oxidizing, and below it is reducing. [7] Solutions traveling downward from the leached zone react with other primary minerals in the oxidised zone to form secondary minerals [ 5 ] such as sulfates and carbonates , and limonite , which is a characteristic product in all oxidised zones.
The slide is then suspended over a water bath with some sort of porus paper over it, so that the slide is steamed. Malachite green is applied to the slide, which can penetrate the tough walls of the endospores, staining them green. After five minutes, the slide is removed from the steam, and the paper towel is removed.