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Moonstone cabochon. The most common moonstone is of the orthoclase feldspar mineral adularia, named for an early mining site near Mt. Adular in Switzerland, now the town of St. Gotthard. [1] [better source needed] A solid solution of the plagioclase feldspar oligoclase +/− the potassium feldspar orthoclase also produces moonstone specimens.
Iridescent regional varieties, which are quite similar in composition and properties to belomorite, are naturally less common, but it would be wrong to call them rare minerals. Plagioclases with moonlight have long been known in some pegmatite veins of Shaitanka and Lipovka (Middle Urals ), as well as in Utochkina Pad near Ulan-Ude ( Buryatia ).
Citrine “A powerful gemstone crystal in a range of deep yellows, oranges, and yellow-cream-white, the citrine gemstone is said to bring abundance and wealth into one’s life,” Salzer says.
The Statue of Liberty, showing advanced patination; verdigris is responsible for the statue's iconic green colour.. Verdigris (/ ˈ v ɜːr d ɪ ɡ r iː (s)/) [1] is a common name for any of a variety of somewhat toxic [2] [3] [4] copper salts of acetic acid, which range in colour from green to a bluish-green depending on their chemical composition.
Emerald is a green variety of beryl and is composed of silicate of alumina and glucina. Structurally, it is a hexagonal crystal with a brilliant reflecting green colour. The emerald is highly polished and is found in metamorphic rocks, granites, and mica schist.
Malachite is a copper carbonate hydroxide mineral, with the formula Cu 2 CO 3 (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 deep, underground spaces, where the water table and hydrothermal fluids provide the means for chemical precipitation.
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