Rocks

The questions that this post on scoria vs. pumice will tackle are: What does scoria have in common with pumice,

Pumice is an extremely low density, frothy, form-like or highly vesicular volcanic rock with a glass texture. This rock is

Rhyolite is a fine-grained to glassy, light-colored, silica-rich extrusive volcanic rock that often has a porphyritic texture. It forms when

Norite is a coarse-grained plutonic rock with mainly calcic plagioclase, orthopyroxene, and a minor amount of other minerals. Plutonic rocks

Obsidian uses include making prehistoric stone tools. Photo credit: Ismoon (talk) 21:26, 8 June 2018 (UTC), CC BY-SA 4.0, via Wikimedia Commons.

Dacite is a fine-grained, light-colored volcanic rock with a felsic composition. Felsic rocks are silica-rich and dominated by light-colored elements

Dacite and andesite are both fine-grained volcanic and extrusive igneous rocks. Volcanic or extrusive igneous rocks form when magma cools

Monzonite is a coarse-grained, plutonic, or intrusive igneous rock with an intermediate composition. Plutonic or intrusive rocks form deep inside

Quartz monzonite is a coarse-grained, felsic plutonic, or intrusive igneous rock. Felsic rocks are light-colored rocks rich in lighter elements