तांबा का नीला कार्बोनेट; नीला मलाकाइट

azurite's Usage Examples:

Crystals: soft blue crystals, such as blue lace agate, blue beryl or azurite.

Copper carbonates are of wide occurrence in the mineral kingdom, and constitute the valuable ores malachite and azurite.

Frequently intermixed with the green malachite is the blue carbonate chessylite or azurite, an ore containing when pure 55.16% of the metal.

It is a constituent of the minerals cerussite, malachite, azurite, spathic iron ore, calamine, strontianite, witherite, calcite aragonite, limestone, 'c. It may be prepared by burning carbon in excess of air or oxygen, by the direct decomposition of many carbonates by heat, and by the decomposition of carbonates with mineral acids, M2C03+2HC1=2MCl-FH 2 O+CO 2.

Many are found as minerals, the more important of such naturally occurring carbonates being cerussite (lead carbonate, PbC03), malachite and azurite (both basic copper carbonates), calamine (zinc carbonate, ZnCO 3), witherite (barium carbonate, BaCO 3), strontianite (strontium carbonate, SrC03), calcite (calcium carbonate, CaC03), dolomite (calcium magnesium carbonate, CaCO 3 MgCO 3), and sodium carbonate, Na 2 CO 3.

Being less hydrated than malachite it is itself liable to alteration into this mineral, and pseudomorphs of malachite after azurite are not uncommon.

It was known to Pliny under the name caeruleum, and the modern name azurite (given by F.

AZURITE, or Chessylite, a mineral which is a basic copper carbonate, 2CuCO 3 Cu(OH) 2.

Azurite occurs with malachite in the upper portions of deposits of copper ore, and owes its origin to the alteration of the sulphide or of native copper by water containing carbon dioxide and oxygen.

Crystals of azurite belong to the monoclinic system; they have a vitreous lustre and are translucent.

azurite's Meaning':

blue carbonate of copper; blue malachite