1) Calcium mineral 2) Iron mineral
Found on
https://www.crosswordclues.com/clue/pigeonite
Pigeonite is a mineral in the clinopyroxene group. It has a general formula of (Ca,Mg,Fe)(Mg,Fe)Si2O6. The calcium cation fraction can vary from 5% to 25%, with iron and magnesium making up the rest of the cations. Pigeonite crystallizes in the monoclinic system, as does augite, and a miscibility gap exists between the two minerals. At lower tempe...
Found on
http://en.wikipedia.org/wiki/Pigeonite
(from the article `pyroxene`) Uninverted pigeonites (monoclinic) are common as phenocrysts in high-temperature, rapidly cooled lavas and in some intrusives such as diabases. In ...
Found on
http://www.britannica.com/eb/a-z/p/67
No exact match found.
