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Torbernite, also known as chalcolite, [6] is a relatively common mineral with the chemical formula Cu[(UO 2)(PO 4)] 2 (H 2 O) 12. [1] It is a radioactive, hydrated green copper uranyl phosphate, found in granites and other uranium-bearing deposits as a secondary mineral.
Table, 1775–1780, wood, carved, painted, and partly gilded, and black granite top not original to table, Metropolitan Museum of Art, New York City Six-light candelabrums with stands, by Alexis Decaix, 1802–1806, gilt bronze, Metropolitan Museum of Art
Phenakite or phenacite is a fairly rare nesosilicate mineral consisting of beryllium orthosilicate, Be 2 Si O 4.Occasionally used as a gemstone, phenakite occurs as isolated crystals, which are rhombohedral with parallel-faced hemihedrism, and are either lenticular or prismatic in habit: the lenticular habit is determined by the development of faces of several obtuse rhombohedra and the ...
First found in the United States, unakite has a worldwide distribution, having also been reported in South Africa, Sierra Leone, Brazil, China, India and Australia. Some material labeled unakite lacks the feldspar and is more properly called epidosite , and is also used as beads and cabochons .
This is a list of gemstones, organized by species and types. Minerals There ... (Top) 1 Minerals. Toggle Minerals subsection. 1.1 A–B. 1.2 C–F. 1.3 G–L. 1.4 M ...
A larvikite quarry in Larvik, Norway, 2008 Polished larvikite (marketed as "Blue Pearl Granite"), showing labradorescence, is a popular decorative stone. Light larvikite with a polished surface Larvikite is an igneous rock , specifically a variety of monzonite , [ 1 ] notable for the presence of thumbnail-sized crystals of feldspar .
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Granite (/ ˈ É¡ r æ n ɪ t / GRAN-it) is a coarse-grained intrusive igneous rock composed mostly of quartz, alkali feldspar, and plagioclase. It forms from magma with a high content of silica and alkali metal oxides that slowly cools and solidifies underground. It is common in the continental crust of Earth, where it is found in igneous ...
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