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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.
The Crassulaceae (/ ˈ k r æ s j uː l eɪ s iː ˌ iː,-s i ˌ aɪ /, from Latin crassus, thick), also known as the crassulas, the stonecrops or the orpine family, are a diverse family of dicotyledon angiosperms primarily characterized by succulent leaves and a form of photosynthesis known as crassulacean acid metabolism (CAM), in which plants photosynthesize in the daytime and exchange ...
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.
The larvae bore through roots, logs, stems, and leaves of various types of plants, ranging from trees to grasses. The wood boring types generally favor dying or dead branches on otherwise-healthy trees, while a few types attack green wood; some of these are serious pests capable of killing trees and causing major economic damage, such as the ...
The structure is a crumpled form of a structure in which the three-fold axes of each tetrahedron lie in planes parallel to the faces of the unit cell, thus putting half the oxygen atoms in the faces. As the temperature is raised the sodalite structure expands and uncrumples, becoming more like this structure.
Carnelian (also spelled cornelian) [3] is a brownish-red mineral commonly used as a semiprecious stone.Similar to carnelian is sard, which is generally harder and darker; the difference is not rigidly defined, and the two names are often used interchangeably.
Dioptase is popular with mineral collectors, and it is occasionally cut into small emerald-like gems. Dioptase and chrysocolla are the only relatively common copper silicate minerals. A dioptase gemstone should never be exposed to ultrasonic cleaning or the fragile gem will shatter.
The leaf-like bracts are membranous, while the smaller bracteoles are either membranous or absent. [4] [5] The leaf bases are surrounded by up to 5 membranous sheaths called cataphylls, a specialised leaf. The bases of the cataphylls form the corm tunic, and their number varies from 3 to 6, and enclose the true leaves (euphylls), bracts ...