 | near Centralia, Washington |
 |
GEOLOGY
The augite crystals (phenocrysts) are scattered through a greenish black augite-plagioclase porphyry lithic tuff.
Visit Washington Geology, Vol. 27, NO 2/3/4/ December 1999 for more information about this locality.
MINERALS
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| Ca(Mg,Fe)Si2O6 - euhedral phenocrysts to 1", most ~1/2" in length. Most crystals show perfect monoclinic symmetry. Some are twinned on {100} |
AUGITE phenocrysts |
