(Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6] |
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AUGITE phenocryst in tuffaceous matrix Doty Hills |
AUGITE phenocrysts looking down the b-axis left: {100} twinned crystal right: monoclinic crystal Doty Hills |
AUGITE {100} twinned crystal with distinct overgrowth zoning Doty Hills |