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单词 malachite
释义

malachite

enUK

mal·a·chite

M0053100 (măl′ə-kīt′)n. A light to dark green carbonate mineral, Cu2CO3(OH)2, used as a source of copper and for ornamental purposes.
[Middle English molochite, melochite (the Modern English spelling being influenced by Greek malakhē, mallow), ultimately (partly via Anglo-Norman melochite) from Latin molochītes, an Arabian stone said by Pliny the Elder (perhaps influenced by folk etymology) to be the color of mallows, from Greek molokhītis, perhaps from malakhē, molokhē, mallow, of Semitic origin; see mlḥ in Semitic roots.]

malachite

(ˈmæləˌkaɪt) n (Minerals) a bright green mineral, found in veins and in association with copper deposits. It is a source of copper and is used as an ornamental stone. Composition: hydrated copper carbonate. Formula: Cu2CO3(OH)2. Crystal structure: monoclinic[C16: via Old French from Latin molochītēs, from Greek molokhitis mallow-green stone, from molokhē mallow]

mal•a•chite

(ˈmæl əˌkaɪt)

n. a green mineral, basic copper carbonate, Cu2CO3(OH)2, an ore of copper, used for making ornamental articles. [1650–60; < Greek malách(ē) mallow + -ite1]

mal·a·chite

(măl′ə-kīt′) A bright-green copper carbonate mineral found in copper veins and used as a copper ore. Malachite often occurs together with the mineral azurite.
Thesaurus
Noun1.malachite - a green or blue mineral used as an ore of copper and for making ornamental objectsmalachite - a green or blue mineral used as an ore of copper and for making ornamental objectsatomic number 29, copper, Cu - a ductile malleable reddish-brown corrosion-resistant diamagnetic metallic element; occurs in various minerals but is the only metal that occurs abundantly in large masses; used as an electrical and thermal conductormineral - solid homogeneous inorganic substances occurring in nature having a definite chemical compositionazurite - blue carbonate of copper; blue malachite
Translations

malachite

enUK

malachite

(măl`əkīt), a mineral, the green basic carbonate of copper occurring in crystals of the monoclinic system or (more usually) in masses. It is translucent or opaque; the luster is silky, vitreous, adamantine, or dull. It takes a good polish. An important ore of copper, it also serves as a gem and for various ornamental purposes and, when finely ground, as a pigment. It is found associated with other ores of copper (especially azuriteazurite
, blue mineral, the basic carbonate of copper, occurring in monoclinic crystals or masses that range from transparent to translucent and opaque. It is usually associated with malachite, which it resembles except in color; when the two minerals are very closely
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) in various parts of the United States and in Chile, Russia, Congo (Kinshasa), Zimbabwe, and Australia.

Malachite

 

a carbonate mineral; composition Cu2[Co3] (OH)2 and containing 57.4 percent Cu. Additional (OH)1— anions in the crystalline structure of malachite are bonded to Cu2+ ions, which are surrounded in one plane by two (OH)1— and two O2+ ions belonging to the (CO3)2- carbonate anion. The most common admixtures are Zn (which isomorphically substitutes for Cu), CaO, SiO2, and Fe2O3.

Malachite crystallizes in the monoclinic system. Crystals, which are acicular or prismatic, are rare. Common formations of malachite are cryptocrystalline or microcrystalline reniform incrustations and stalactitic aggregates, which are evenly banded and divergently fibrous. Earthy malachite masses are known as green copper carbonates. The color of malachite ranges from bright green and bluish green to dark green and sometimes even brownish green. The changes that occur in color in the various zones and layers of reniform masses of malachite create very beautiful and fanciful designs along cut and polished planes. Malachite has a hardness of 3.5-4.0 on Mohs’ scale and a density of 3,900-4, 100 kg/m3.

In nature, malachite occurs in the upper oxidized zones of sulfide copper ores. Large accumulations of solid malachite are extremely rare and form during the replacement of limestone by copper sulfate in the oxidation zone of massive copper deposits. Such accumulations (up to 50 m) were worked in the Urals (in the vicinity of Nizhnii Tagil) during the 18th and 19th centuries; other deposits containing ornamental malachite are located in Chile. Solid malachite is a valuable ornamental material and is used to make jewelry and decorative objects (insets, beads, veneer for table tops, vases, column facings). Large articles are faced with thin malachite plates, which are matched according to design and pasted onto a matrix made of metal or other material (“Russian mosaic”). All ornamental objects and large articles are usually fashioned from Ural malachite (The Hermitage in Leningrad, various palace-museums in the USSR and other countries).

Earthy malachite and small accumulations of the pure mineral are used in the manufacture of the valuable paint known as malachite green. Malachite occurring in mixed oxidized ores is used in the smelting of copper.

G. P. BARSANOV

malachite

[′mal·ə‚kīt] (mineralogy) Cu2CO3(OH)2 A bright-green monoclinic mineral consisting of a basic carbonate of copper and usually occurring in massive forms or in bundles of radiating fibers; specific gravity is 4.05, and hardness is 3.5-4 on Mohs scale.

malachite

A carbonate of copper; green in color; harder than marble; usually employed as a highly polished veneer.

malachite

guards wearer from evil spirits, enchantments. [Gem Symbolism: Kunz, 97]See: Protection

malachite

a bright green mineral, found in veins and in association with copper deposits. It is a source of copper and is used as an ornamental stone. Composition: hydrated copper carbonate. Formula: Cu2CO3(OH)2. Crystal structure: monoclinic

malachite

enUK
  • noun

Words related to malachite

noun a green or blue mineral used as an ore of copper and for making ornamental objects

Related Words

  • atomic number 29
  • copper
  • Cu
  • mineral
  • azurite
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