The Colors Of Granite Depend On The Mineral Grain Size

On the other hand if the molten rock is abundant in quartz and minerals that make.

The colors of granite depend on the mineral grain size.

The overall color of granite depends largely on the kind of feldspar in the. Slow cooling of diorite results into coarse grain size due to large crystals formation with more ion transport. If the molten rock was abundant in potassium feldspar the granite is more likely to take on a salmon pink color. Numerous other minerals can be present in granite.

Ferromagnesium minerals are dark colored. The most common colors of granite are white pink yellow grey and black primarily because of its composition. Granite and gabbro are examples of. Trace minerals such as mica and amphiboles also affect the color and composition.

Using your knowledge of this information for the igneous rocks listed place the rock. But color can be misleading when applied to rocks of the same composition but different grain size. Under certain conditions the mineral grains can grow very large. It is about two inches across.

But a rapidly cooled volcanic rock with the same composition as the granite could be entirely. The black grains can be biotite or hornblende. One objection to the earth being only 6 000 years old as described in the bible is the claim that the coarse grained texture of granites shows they cooled slowly over millions of years. Quartz is milky white feldspar is white potassium feldspar is pink biotite is black or brown muscovite is yellow and amphibole is green.

The pink grains are orthoclase feldspar and the clear to smoky grains are quartz or muscovite. Peridotite basalt gabbro diorite rhyolite. Of course diorite and andesite have the same mineral content and occur in the same areas. The classification of igneous rocks depends on both grain size and silica composition.

For example a granite consists of lots of quartz and feldspar and is generally light colored. The grain size is coarse enough to allow recognition of the major minerals. The specimen above is a typical granite. The difference is grain size and cooling rate during the rock formation process.

The minerals found in granite are typically light colored and may vary depending on which minerals are prevalent. Coarse grain varieties with mineral grains large enough to see without a magnifying glass are called phaneritic.