* Mafic rocks are characterized by high amounts of magnesium (Mg) and iron (Fe). They are typically dark-colored and have a relatively high density. Examples include basalt and gabbro.
* Pumice is a type of felsic igneous rock, meaning it is rich in silica (SiO2) and has a light color. It is also highly porous, which is what makes it float.
Here's a breakdown of the key differences:
| Feature | Mafic Rocks | Felsic Rocks |
|---|---|---|
| Composition | High Mg and Fe, low SiO2 | High SiO2, low Mg and Fe |
| Color | Dark | Light |
| Density | High | Low |
| Porosity | Low | High (in the case of pumice) |
So, while both pumice and mafic rocks are igneous rocks, they fall on opposite ends of the compositional spectrum.
