1) Carbonate mineral 2) Monoclinic mineral
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https://www.crosswordclues.com/clue/nahcolite
Nahcolite is a soft, colourless or white carbonate mineral with the composition of sodium bicarbonate (NaHCO3) also called thermokalite. It crystallizes in the monoclinic system. Nahcolite was first described in 1928 for an occurrence in a lava tunnel at Mount Vesuvius, Italy. Its name refers to the elements which compose it: Na, H, C, and O. It o...
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http://en.wikipedia.org/wiki/Nahcolite
colourless to white carbonate mineral (NaHCO3), a naturally occurring sodium bicarbonate. Its structure consists of planar chains of carbonate ...
Found on
http://www.britannica.com/eb/a-z/n/3
a carbonate mineral, naturally occurring sodium bicarbonate, NaHCO.
Found on
https://www.infoplease.com/dictionary/nahcolite
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