No. Silica is not a rock; it is a component of many minerals found in all three rock types.
Granite is actually high in silica, which is why it is considered a felsic igneous rock. An example of an igneous rock low in silica is basalt, which is mafic in composition and contains less silica than granite.
An igneous rock with a high level of silica will have a light color.
Ultramafic igneous rock contains the least silica.
Felsic igneous rock contains the highest proportion of silica. Granites are felsic igneous rocks.
An igneous rock's color is mainly determined by its silica content.
The more silica contained in a rock, the lighter in color it will be.
volcanic rocks
No, rhyolite is a silica-rich volcanic or igneous rock.
I would expect a light gray igneous rock to be rich in silica. Light gray color in igneous rocks is often associated with high silica content, which is typical of felsic or granitic compositions.
Basalt.
Igneous rocks that are medium colored and have no silica are called mafic rocks. They are mainly composed of magnesium and iron.
Basalt is a dark-colored, low-silica igneous rock commonly found as a result of volcanic activity. Its composition typically contains around 50% silica, making it relatively low in silica compared to other igneous rocks like granite.