Here's why:
* Granite is a type of igneous rock. It's formed from cooled magma and contains a variety of minerals, including quartz, feldspar, and mica. These minerals give granite its characteristic speckled appearance.
* Black granite doesn't exist because of the mineral composition. While granite can be dark in color, it will never be truly black. The presence of light-colored minerals like quartz and feldspar will always prevent it from being a completely solid black.
What is often marketed as "black granite" is actually:
* Black gabbro: This is a type of igneous rock similar to granite, but with a different mineral composition that results in a darker color.
* Black basalt: This is another type of igneous rock, often mistaken for granite due to its dark color.
* Polished black limestone or marble: These are metamorphic rocks that can be very dark and, after polishing, can resemble granite.
So, if you see "black granite" being sold, it's likely not true granite but a different type of rock that's been mislabeled.