1) Igneous rock
Found on
https://www.crosswordclues.com/clue/carbonatite
Carbonatites t are intrusive or extrusive igneous rocks defined by mineralogic composition consisting of greater than 50 percent carbonate minerals. Carbonatites may be confused with marble, and may require geochemical verification. Carbonatites usually occur as small plugs within zoned alkalic intrusive complexes, or as dikes, sills, breccias, an...
Found on
http://en.wikipedia.org/wiki/Carbonatite
(from the article `mineral deposit`) Carbonatites are igneous rocks that consist largely of the carbonate minerals calcite and dolomite; they sometimes also contain the rare-earth ore ... ...contain thick (a few metres) layers of chromite, which is the source of chromium and also platinum. Two other rare occurrences in cratonic ... [...
Found on
http://www.britannica.com/eb/a-z/c/23
No exact match found.
