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Generally, dark navy blue chrysocolla is too soft to be used in jewelry, while cyan, green, and blue-green chrysocolla can have a hardness approaching 6, similar to turquoise. Chrysocolla chalcedony is a heavily silicified form of chrysocolla that forms in quartz deposits and can be very hard and approach a hardness of 7. [9] [10] [11]
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 ...
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.
This list includes those recognised minerals beginning with the letter C.The International Mineralogical Association is the international group that recognises new minerals and new mineral names; however, minerals discovered before 1959 did not go through the official naming procedure, although some minerals published previously have been either confirmed or discredited since that date.
Radiating spray of colorless wheatsheaf calcite crystals on matrix, from Iraí, Rio Grande do Sul, Brazil Rhombohedrons of calcite that appear almost as books of petals, piled up 3-dimensionally on the matrix, from Eastern Europe Sky blue, prismatic crystals of celestine from Majunga, Madagascar Pocket cavity of small chrysocolla stalactites ...
Mineral riches in the form of gold, silver, sapphire, coal, and copper have long attracted prospectors who dreamed of digging up their next fortune. The state's dazzling natural resources led to a ...
In northern Peru, the World Bank's business-lending arm is part owner of the Yanacocha gold mine, accused by impoverished farming communities of despoiling their land in pursuit of the precious ore. The bank and IFC have stepped up investments in projects deemed to have a high risk of serious and environment damage, including oil pipelines, mines and even coal-fired power plants, an ...
Intergrowth with other secondary copper minerals such as chrysocolla is also common. Turquoise is distinguished from chrysocolla, the only common mineral with similar properties, by its greater hardness. [2] Turquoise forms a complete solid solution series with chalcosiderite, CuFe 6 (PO 4) 4 (OH) 8 ·4H 2 O, in which ferric iron replaces ...