Blocks are large chunks of solid rock that are at least 256 sq. Bombs are small clots of magma that have a diameter of 64 through 256 millimeters. Their shapes are spherical, spindle-shaped, ribbon, and bread crust. Scoria is rich in iron and magnesium. However, it is very poor in silica.
Pumice is the exact opposite.
It is poor in iron and magnesium, yet very rich in silica. This results in the color of Pumice being much lighter. Pele s hair is naturally spun glass. It is usually gold colored. Pele s tears are very dark droplets of solidified glass.