Augite

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  1. A rock-forming ferromagnesian silicate mineral built around single chains of silicon-oxygen tetrahedra.
    Source: Leet, L. Don. 1982. Physical Geology, 6th Edition. Englewood Cliffs, NJ: Prentice-Hall
  2. A monoclinic mineral, 8[(Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2 O6 ] ; pyroxene group; dark-green to black with prismatic cleavage; a common rock-forming mineral in igneous and metamorphic rocks. Syn: basaltine; fassaite; pyroxene. CF: pigeonite
    Source: Dictionary of Mining, Mineral, and Related Terms


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