Tonalite |
|
 Tonalite (or Granodiorite)Intrusive igneous rock of intermediate to felsic composition. This soample displays plagioclase feldspar (white), quartz (gray), and biotite and magnetite (black).Terra Blanca Mountains alluvial fan gravel deposit, San Diego County, California |
| https://gotbooks.miracosta.edu/rocks/igneous/27.html | 2/2/2021 |