G2-granite hand sample taken from its incubating mountain
by Metwally Hamza, Research Assistant in the field of geology with international published research papers. Academically interested in cosmic geology & planetary sciences. Geology fiend who likes to take photos of nature & geological features, Egypt
Granite is a very common rock, not only in geoscience but also in industry and daily life. If you live in a modern city and have a well-prepared house, exactly the kitchen or at least the stairs of your own house are made from granite.
Granite is not only one type, as it is well-known in geoscience. Even in industry, any color has a different price. The green granite is the most expensive; the pink granite is slightly more expensive; but the black-white granite is a common and popular one.
The difference in its color comes back to the mineral assemblage that comes into forming it, also known as the rock-forming minerals.
The published hand sample you see here is of G2-granite with a pink color. In addition, G1-granite has a gray or black-white color, but G3-granite has a dim red color or a dense brownish red color.
1. The white mineral grains that appear in the sample here are of plagioclase "pl".
2. The black ones are made of mafic minerals (mafic: dark minerals).
3. The semi-brown minerals are of orthoclase "or".
Metwally Hamza (distributed via imaggeo.egu.eu)