near Centralia, Lewis County, Washington, USA |
| Ca(Mg,Fe)Si2O6 - Occurs as euhedral phenocrysts to 1 ", most about 1/2" in length. Most crystals show perfect monoclinic symmetry. Some are twinned on {100} |
AUGITE phenocryst in matrix |
AUGITE phenocrysts |
AUGITE, zoned and twinned phenocryst |