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  2. Malachite - Wikipedia

    en.wikipedia.org/wiki/Malachite

    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.

  3. Prices of chemical elements - Wikipedia

    en.wikipedia.org/wiki/Prices_of_chemical_elements

    Per-kilogram prices of some synthetic radioisotopes range to trillions of dollars. ... (⁠ mg / kg ⁠) Price [7] Year Source Notes USD/kg USD/L [c] 1: H: Hydrogen ...

  4. Eilat stone - Wikipedia

    en.wikipedia.org/wiki/Eilat_stone

    Eilat Stone (Hebrew: אבן אילת) is a gemstone that derives its name from the city of Eilat in Israel, where it was once mined. It is characterized by a green-blue heterogeneous mixture of several secondary copper minerals, including malachite , azurite , turquoise , pseudomalachite , and chrysocolla .

  5. Crystal healing - Wikipedia

    en.wikipedia.org/wiki/Crystal_healing

    The miners are usually paid between 17 and 23 cents per kilogram for rose quartz (≈ 8 - 11 cents per pound). [5] The miner's income may be just 0.1% of the final retail price. [ 5 ] Some people in the industry say that the low pay for miners is because customers in developed countries want low retail prices; others say that it is due to shops ...

  6. Smelting - Wikipedia

    en.wikipedia.org/wiki/Smelting

    The impact was so pervasive that scholars traditionally divide ancient history into Stone Age, Bronze Age, and Iron Age. In the Americas , pre- Inca civilizations of the central Andes in Peru had mastered the smelting of copper and silver at least six centuries before the first Europeans arrived in the 16th century, while never mastering the ...

  7. Siproeta stelenes - Wikipedia

    en.wikipedia.org/wiki/Siproeta_stelenes

    Siproeta stelenes (malachite) is a Neotropical brush-footed butterfly (family Nymphalidae). The malachite has large wings that are black and brilliant green or yellow-green on the upperside and light brown and olive green on the underside. It is named for the mineral malachite, which is similar in color to the bright green on the butterfly's ...