Ask-a-Geologist Video #11: Why do pumice and scoria have holes and granite does not?

Hi everyone, today we have another great ask-a-geologist question from one of our fabulous readers. Peter wrote to us and asked: Granite, pumice, and scoria are igneous rocks, but why doesn’t granite have airholes, but the other two do?

Ask-A-Geologist Q&A #2: What is Syenite Used For?

What is the rock syenite used for?

Igneous Rocks

Igneous rocks form from hot liquid magma beneath the Earth’s surface.

New Igneous Rocks – Volcanic Ash and Graphic Granite

We have two new igneous samples for you – graphic granite and volcanic ash. Check them out today. Both of these samples make great additions to your collection!