Quartz
![Quartz](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/thumbnails/image/quartz.jpg?itok=UyUuCNK9)
Detailed Description
Quartz is one of the most common minerals in the Earth's crust. It is made up of silicon dioxide (SiO 2 ), otherwise known as silica. This common, hard silicate mineral was used to make tools.
Sources/Usage
Public Domain.