EPSC 201 Lecture Notes - Lecture 12: Debris Flow, Clastic Rock, Subduction
11 Mar 2013
School
Department
Course
Professor
Document Summary
It could be many minerals, or only one mineral. Com- monly, rocks have about 5-10 different minerals. Granite is a rock with a particular assembly of miner- als. At hardware stores, they sell different types of. Granite countertops, but they are not actually gran- ite. Granite is usually light, but depending on impuri- ties, it can take other colors. Potassium feldspar in granite gives a pink color. If the granite is white, the impurity could be albite. (al- bite = variety of feldspar). So the color allows us to identify types of minerals present in the granite. Biotite a flaky mineral, formed from sheet silicate. Amphibole a dark mineral formed from chain silicate, that does not flake like biotite. These rocks are formed through the rock cycle. Basalt is an example of igneous rock because it formed from lava flowing out of the earth. These rocks are formed from a liquid (magma).
