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    The mineral Azurite


















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The following was retrieved from Wikipedia, the free encyclopedia :  ( en.wikipedia.org/wiki/Azurite ) on February 28, 2020.

"Azurite 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. The mineral, a carbonate with the chemical formula Cu3(CO3)2(OH)2, has been known since ancient times, and was mentioned in Pliny the Elder's Natural History under the Greek name kuanos (κυανός: "deep blue", root of English cyan) and the Latin name caeruleum. Since antiquity, azurite's exceptionally deep and clear blue has been associated with low-humidity desert and winter skies. The modern English name of the mineral reflects this association, since both azurite and azure are derived via Arabic from the Persian lazhward, an area known for its deposits of another deep-blue stone, lapis lazuli ("stone of azure").

Mineralogy



Azurite is one of two basic copper(II) carbonate minerals, the other being bright green malachite. Simple copper carbonate (CuCO3) is not known to exist in nature. Azurite has the formula Cu3(CO3)2(OH)2, with the copper(II) cations linked to two different anions, carbonate and hydroxide. Small crystals of azurite can be produced by rapidly stirring a few drops of copper sulfate solution into a saturated solution of sodium carbonate and allowing the solution to stand overnight.

Azurite crystals are monoclinic. Large crystals are dark blue, often prismatic. Azurite specimens can be massive to nodular. They are often stalactitic in form. Specimens tend to lighten in color over time due to weathering of the specimen surface into malachite. Azurite is soft, with a Mohs hardness of only 3.5 to 4. The specific gravity of azurite is 3.77 to 3.89. Azurite is destroyed by heat, losing carbon dioxide and water to form black, copper(II) oxide powder. Characteristic of a carbonate, specimens effervesce upon treatment with hydrochloric acid.

Color

The optical properties (color, intensity) of minerals such as azurite and malachite are characteristic of copper(II). Many coordination complexes of copper(II) exhibit similar colors. As explained within the context of ligand field theory, the colors result from low energy d-d transitions associated with the d9 metal center.

Weathering

Azurite is unstable in open air compared to malachite, and often is pseudomorphically replaced by malachite. This weathering process involves the replacement of some of the carbon dioxide (CO2) units with water (H2O), changing the carbonate:hydroxide ratio of azurite from 1:1 to the 1:2 ratio of malachite:

2 Cu3(CO3)2(OH)2 + H2O → 3 Cu2(CO3)(OH)2 + CO2 From the above equation, the conversion of azurite into malachite is attributable to the low partial pressure of carbon dioxide in air. Azurite is also incompatible with aquatic media, such as saltwater aquariums."

The license terms of this written work from Wikipedia may be found at http://creativecommons.org/licenses/by-sa/3.0/













  Common Minerals



»  Alunite
»  Amphibole
»  Anorthoclase
»  Apatite
»  Azurite
»  Barite
»  Beryl
»  Biotite
»  Bauxite


»  Borax
»  Calcite
»  Carnotite
»  Chalcopyrite
»  Chromite
»  Chrysocolla
»  Cinnabar
»  Corundum
»  Cryolite


»  Cuprite
»  Diamond
»  Dioptase
»  Dolomite
»  Epidote
»  Euclase
»  Feldspar
»  Fluorite
»  Galena


»  Garnet
»  Graphite
»  Gypsum
»  Halite
»  Hematite
»  Hornblende
»  Hydroxylapatite
»  Jadeite
»  Labradorite


»  Leaverite
»  Lepidolite
»  Magnetite
»  Malachite
»  Marcasite
»  Mica
»  Microcline
»  Molybdenite
»  Muscovite


»  Natron
»  Oligoclase
»  Olivine
»  Oregonite
»  Orthoclase
»  Plagioclase
»  Pyrite
»  Quartz
»  Realgar


»  Scheelite
»  Selenite
»  Siderite
»  Simonellite
»  Sphalerite
»  Spinel
»  Stibnite
»  Talc
»  Tanzanite


»  Tellurite
»  Topaz
»  Tourmaline
»  Turquoise
»  Uraninite
»  Wulfenite
»  Zeolite
»  Zircon










  Common Rocks



Igneous :

»  Andesite
»  Basalt
»  Dacite
»  Diorite
»  Gabbro
»  Granite

»  Obsidian
»  Pegmatite
»  Porphyry
»  Pumice
»  Rhyolite
»  Scoria

Sedimentary :

»  Banded iron fm.
»  Breccia
»  Chalk
»  Claystone
»  Coal

»  Conglomerate
»  Coquina
»  Diatomite
»  Evaporite
»  Flint

»  Limestone
»  Marl
»  Mudstone
»  Oil shale
»  Oolite

»  Sandstone
»  Shale
»  Siltstone
»  Travertine
»  Wackestone

Metamorphic :

»  Anthracite
»  Amphibolite
»  Gneiss
»  Marble

»  Quartzite
»  Schist
»  Serpentine
»  Slate










  The Elements



Actinium  89
Aluminum  13
Americium  95
Antimony  51
Argon  18
Arsenic  33
Astatine  85
Barium  56
Berkelium  97
Beryllium  4
Bismuth  83
Bohrium  107
Boron  5
Bromine  35
Cadmium  48


Calcium  20
Californium  98
Carbon  6
Cerium  58
Cesium  55
Chlorine  17
Chromium  24
Cobalt  27
Copernicium  112
Copper  29
Curium  96
Darmstadtium  110
Dubnium  105
Dysprosium  66
Einsteinium  99


Erbium  68
Europium  63
Fermium  100
Flerovium  114
Fluorine  9
Francium  87
Gadolinium  64
Gallium  31
Germanium  32
Gold  79
Hafnium  72
Hassium  108
Helium  2
Holmium  67
Hydrogen  1


Indium  49
Iodine  53
Iridium  77
Iron  26
Krypton  36
Lanthanum  57
Lawrencium  103
Lead  82
Lithium  3
Livermorium  116
Lutetium  71
Magnesium  12
Manganese  25
Meitnerium  109
Mendelevium  101


Mercury  80
Molybdenum  42
Moscovium  115
Neodymium  60
Neon  10
Neptunium  93
Nickel  28
Nihonium  113
Niobium  41
Nitrogen  7
Nobelium  102
Oganesson  118
Osmium  76
Oxygen  8
Palladium  46


Phosphorus  15
Platinum  78
Plutonium  94
Polonium  84
Potassium  19
Praseodymium  59
Promethium  61
Protactinium  91
Radium  88
Radon  86
Rhenium  75
Rhodium  45
Roentgenium  111
Rubidium  37
Ruthenium  44


Rutherfordium  104
Samarium  62
Scandium  21
Seaborgium  106
Selenium  34
Silicon  14
Silver  47
Sodium  11
Strontium  38
Sulfur  16
Tantalum  73
Technetium  43
Tellurium  52
Tennessine  117
Terbium  65


Thallium  81
Thorium  90
Thulium  69
Tin  50
Titanium  22
Tungsten  74
Uranium  92
Vanadium  23
Xenon  54
Ytterbium  70
Yttrium  39
Zinc  30
Zirconium  40























There are currently 118 known chemical elements exhibiting a large number of different physical and chemical properties. Amongst this diversity, scientists have found it useful to use names for various sets of elements, that illustrate similar properties, or their trends of properties. Many of these sets are formally recognized by the standards body IUPAC.

The following collective names are recommended by IUPAC:

Alkali metals – The metals of group 1: Li, Na, K, Rb, Cs, Fr.

Alkaline earth metals – The metals of group 2: Be, Mg, Ca, Sr, Ba, Ra.

Pnictogens – The elements of group 15: N, P, As, Sb, Bi. (Mc had not yet been named when the 2005 IUPAC Red Book was published, and its chemical properties are not yet experimentally known.)

Chalcogens – The elements of group 16: O, S, Se, Te, Po. (Lv had not yet been named when the 2005 IUPAC Red Book was published, and its chemical properties are not yet experimentally known.)

Halogens – The elements of group 17: F, Cl, Br, I, At. (Ts had not yet been named when the 2005 IUPAC Red Book was published, and its chemical properties are not yet experimentally known.)

Noble gases – The elements of group 18: He, Ne, Ar, Kr, Xe, Rn. (Og had not yet been named when the 2005 IUPAC Red Book was published, and its chemical properties are not yet experimentally known.)

Lanthanoids – Elements 57–71: La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu,

Actinoids – Elements 89–103: Ac, Th, Pa, U, Np, Pu, Am, Cm, Bk, Cf, Es, Fm, Md, No, Lr.

Rare-earth metalsSc Y, plus the lanthanoids

Transition elements – Elements in groups 3 to 11 or 3 to 12.






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