Snowflake obsidian is a form of volcanic glass that features white or grayish “snowflake” shapes made of embedded cristobalite. These pretty patterns are not artificially added as a cheap ...

A compound is a substance that contains two or more elements close elementA pure substance that is made from only one type ... quickly. Obsidian is an example of an extrusive igneous rock.

Hand-carved arrowheads and jagged spears made of obsidian, a sharp rock formed by volcanic magma, are remnants of vast prehistoric trade networks that once cut across western North America.