File:Bulletin 426 Plate XVIII orbicular gabbro-diorite.jpg
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English: Original caption: Surface of orbicular gabbro-diorite, Davie County, NC. Text from the volume regarding this figure: On the Hairston place, 10 miles west of Lexington, there are exposures of orbicular gabbro-diorite. The rock is of dark color with a greenish cast imparted by the hornblende and diallage. It presents a pronounced mottled appearance, being made up of dark-green areas of hornblende, varying from an eighth of an inch to several inches in diameter, set close together, with the interstices filled with white feldspar. (See PI. XVIII.) On a polished surface of the stone the effect is unique and beautiful, and the rock should prove of value for ornamental and decorative purposes. |
| Date | |
| Source | Granites of the Southeastern Atlantic States, Bulletin 426, United States Geological Survey, Government Printing Office, Washington, 1910. |
| Author | Watson, Thomas Leonard |
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