Block of Tonalite, Amphibolite, Migmatite, and Granodiorite
by Metwally Hamza, Full Geologist, Egypt
- Block of four different rocks;
- Tonalite is an igneous, plutonic, intrusive, felsic rock. With phaneritic texture. Feldspar is present as plagioclase (oligoclase or andesine). With 10% or less alkali feldspar. Quartz is present as more than 20% of the rock. The accessory minerals may be amphibole and pyroxene.
- Amphibolite is a metamorphic rock that contains amphibole, hornblende, and actinolite, as well as plagioclase. With little or no quartz. It is typically dark-colored and dense, with a schistose or flaky structure.
- Migmatite is a composite rock found in medium and high-grade metamorphic environments.
- Granodiorite is an intrusive, igneous rock, similar to granite, but containing more plagioclase feldspar than orthoclase feldspar. With a phaneritic texture.
Taken and Itemized by Metwally Hamza.
Taken on 30
Submitted on March 21, 2021
- Africa (316)
- Northern Africa (125)
- Egypt (53)
- Exact location (33.6195 E, 28.2717 N)
geology, geomorphology, petrology
Download original file
662 × 927 px; image/jpeg; 313.7 KB
Credit: Metwally Hamza (distributed via imaggeo.egu.eu)
Click to appreciate