2-3" AZURITE & Malachite Crystal Copper Ore Mineral Specimens * Morocco for Sale

2-3" AZURITE & Malachite Crystal Copper Ore Mineral Specimens * Morocco For Sale

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2-3" AZURITE & Malachite Crystal Copper Ore Mineral Specimens * Morocco:
$3.02

Size: 1.5-3"
Weight: .5-3 Oz.
Locality: MoroccoThis listing is for one Azurite (blue) and Malachite (green) copper specimen from the batch pictured from Morocco. Each specimen is between 1.5-3" in size (most 2") and weighs approx. .5-2 ounces. These very colorful copper ore specimens would make a nice addition to your collection!Link to Our Other Crystal and Mineral SpecimensLink to Our Other Wholesale and Bulk Minerals
AZURITE PROPERTIES:
Azurite is a soft, deep blue copper mineral produced by weathering of copper ore deposits. Azurite has the formula Cu3(CO3)2(OH)2, with the copper cations linked to two different anions, carbonate and hydroxide. It is one of two relatively common basic copper carbonate minerals, the other being bright green malachite. Azurite crystallizes in the monoclinic system. Large crystals are dark blue, often prismatic. Azurite specimens can be massive to nodular or can occur as drusy crystals lining a cavity.Azurite is soft, with a Mohs hardness of only 3.5 to 4. The specific gravity of azurite is 3.77. 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. The combination of deep blue color and effervescence when moistened with hydrochloric acid are identifying characteristics of the mineral. Azurite is found in the same geologic settings as its sister mineral, malachite, though it is usually less abundant. Both minerals occur widely as supergene copper minerals, formed in the oxidized zone of copper ore deposits. Here they are associated with cuprite, native copper, and various iron oxide minerals.MALACHITE PROPERTIES:
Malachite often results from the supergene weathering and oxidation of primary sulfidic copper ores, and is often found with azurite (Cu3(CO3)2(OH)2), goethite, and calcite. Except for its vibrant green color, the properties of malachite are similar to those of azurite and aggregates of the two minerals occur frequently. Malachite was used as a mineral pigment in green paints from antiquity until c. 1800. Malachite is more common than azurite and is typically associated with copper deposits around limestones, the source of the carbonate. Malachite is a copper carbonate hydroxide mineral, with the formula Cu2CO3(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 spaces, deep underground, where the water table and hydrothermal fluids provide the means for chemical precipitation.
Courtesy of Wikipedia
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