Aegirite (Aegirine) is a rock-forming mineral of the pyroxenes group, distinguished by it's long needle-like crystals, found mainly in rocks rich in soda and poor in silica. Named after Aegir, Icelandic god of the sea. It has the formulae NaFe(Si2O6) and a relative hardness of 7.
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a mineral, mainly sodium-ferric iron silicate, NaFe&multiplydot;(SiO), occurring in feldspathoid rocks in slender prismatic crystals.
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