U.S. Geological Survey: Science for a Changing World - USGS visual identifier and link to main Web site at http://www.usgs.gov/

Photomicrograph of a porphyritic-aphanitic basalt. For a more detailed explanation, contact Jonathan Tso at jtso@radford.edu.
 
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
For more information, contact Jonathan Tso
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