The rocks can be identified by the three types of igneous, sedimentary and metamorphic types. Most of the rocks sedimentary rocks have mineral streak streams. Thus a steak test is done by scraping the base of the rock and hence finding out the amount if powdered mineral on the surface of the rocks.
The red color can be attributed to the Aztec sandstones which has such type f structure, due to the presence of iron oxide or hematite and the exposure to other minerals may cause the rocks to rust or change their form and brown color.
Pyrite is one of the most commonly found earth minerals everywhere on the earth in the form of a yellow stretch.
