Ask-A-Geologist #8: What is obsidian rock used for?

Hi everyone! Today I am back with another fabulous question from one of our readers. Today’s question is about obsidian. John asks: What is obsidian rock used for?

Obsidian……Can you use it?

Here is another Ask-a-Geologist that we received. Obsidian is one of our favorite rocks. Children love this rock too! Question: What is obsidian rock used for?