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Chrysocolla has a cyan (blue-green) color and is a minor ore of copper, having a hardness of 2.5 to 7.0. It is of secondary origin and forms in the oxidation zones of copper ore bodies. Associated minerals are quartz , limonite , azurite , malachite , cuprite , and other secondary copper minerals.
Chrysocolla (Cu,Al) 2 H 2 Si 2 O 5 (OH) 4 ·n(H 2 O) 37.9 Tennantite: Cu 12 As 4 S 13: 51.6 Dioptase: CuSiO 2 (OH) 2: 45.3 Enargite: Cu 3 AsS 4: 48.4 References ...
Slice of 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.
Martin Ruland (Lexicon alchemiae) explains chrysocolla as molybdochalkos, a copper-lead alloy. In Leyden papyrus X recipe 31 chrysocolla is an alloy composed of 4 parts copper, 2 parts asem (a kind of tin-copper alloy) and 1 part gold. Argyrochrysocolla appears to designate an alloy of gold and silver. [3]
Chalcophyllite crystallizes in the trigonal crystal class, 3 2/m with space group R 3m [5] or 3 with space group R 3. [2] [3] [4] [6] Some authors choose a unit cell with three formula units per cell (Z = 3), and some a smaller unit cell with only 1.5 formula units per cell (Z = 1.5).
Moche Nariguera depicting the Decapitator, gold with turquoise and chrysocolla inlays. Museo Oro del Peru, Lima Moche "Decapitator" mural at Huaca de la Luna. Both iconography and the finds of human skeletons in ritual contexts seem to indicate that human sacrifice played a significant part in Moche religious practices. These rites appear to ...
Tenorite commonly occurs with chrysocolla and the copper carbonates, azurite and malachite. The dull grey-black color of tenorite contrasts sharply with the often intergrown blue chrysocolla . Cuprite , native copper and Fe – Mn oxides also occur in this environment.
Brochantite is a sulfate mineral, one of a number of cupric sulfates.Its chemical formula is Cu 4 SO 4 (OH) 6. [2] [3] [4] Formed in arid climates or in rapidly oxidizing copper sulfide deposits, it was named by Armand Lévy for his fellow Frenchman, geologist and mineralogist A. J. M. Brochant de Villiers.