|Figure A-11. Carbonatite (carbonate-bearing igneous rock) from west-central Arkansas. Most of the field of view is twinned calcite (C) with amphibole (green) and possible apatite (white) at right.
Photomicrograph was taken in cross -polarized light; field of view is 2.3 mm wide. Garland County, Arkansas; thin section 00-MC4. Sample collected and kindly loaned by Dr. Michael F. Roden.
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