Figure 3.
Photomicrograph of a porphyritic-aphanitic basalt. Clinopyroxene (cpx) and altered olivine (ol) phenocrysts are set in a fine matrix that contains thin laths of plagioclase. Plain polarized light; length of photo is 2.6 mm.
U.S. Department of the Interior
,
U.S. Geological Survey
URL: https:// pubsdata.usgs.gov /pubs/circ/2004/1264/html/trip4/fig3.html
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