Magmas with intermediate composition result from combining two magmas of differing compositions. Silica-rich igneous rocks containing potassium feldspar and quartz are felsic in composition. It is a ...

A Descriptive Petrography of the Igneous Rocks By Prof. Albert Johannsen. Vol. 3: The Intermediate Rocks. Pp. xiv + 360. Vol. 4, Part 1: The Feldspathoid Rocks. Part 2: The Peridotites and Perknites.

Article Google Scholar Freundt-Malecha, B., Schmincke, H. U. & Freundt, A. Plutonic rocks of intermediate composition on Gran Canaria: The missing link of the bimodal volcanic rock suite.

Igneous intrusions are a type of rock feature. They form when molten rock cools below the surface of the Earth. Join Isla and Connor as they explore igneous rock landscape features at Traprain Law ...

When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. You don't need to go to a museum to find really, really old things. Ordinary rocks, for ...

Table 1. Average P2O5 contents of phosphate ore and concentrates from igneous and sedimentary phosphate rocks from various countries around the world. To view an enhanced version of this graphic ...