Further west on the road, heading deeper into the canyon, there are rocks with a
ID: 804199 • Letter: F
Question
Further west on the road, heading deeper into the canyon, there are rocks with alternating light and dark bands.
The lighter bands consist of mineral A that is clear or whitish in color, hard, and does not react to acid.
The dark color bands are made of mineral B that is black or dark green in color, rectangular in shape (long compared to their width) and is a silicate that cleaves in a non-perpendicular way
1. What is Mineral A in this sample?
2. What is Mineral B in this sample?
3 What is the name of this rock?
4. How did this sample form? Be sure to refer to the directions to ensure that all information is included for a complete answer and keep your answer to three sentences or less.
Explanation / Answer
A contains minerals like feldspars and quartz B contains minerals like plagioclase and ferromagnetism magnesium minerals like pyroxene Gneiss is the name of the rock Gneiss is a highly metamorphosed rock which is formed uunder conditions of high pressure and temperature. It can be formed from metamorphism of either sedimentary rocks or igneous rocks. When ever the rock, shale is subjected to metamorphism it turns in to a metamorphic rock called slate, with increasing in metamorphism the slate will turns into phyllite, schist and then gneiss. It can also be ormbybthe metamorphism of igneous rocks like granite
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