Because crystalline silica forms the common mineral quartz as well as less common minerals and because the Hazard Communication Standard affects production and use of many mineral commodities, it is important to understand what crystalline silica is and is not, where it is found and used, and how it is qualitatively and quantitatively identified.

This publication addresses these issues. Chapter 1 describes what crystalline silica is and how we come in contact with it. Chapter 2 discusses the regulatory decisions that have created new interest in this widespread substance and presents an overview of the techniques used to determine the presence and abundance of crystalline silica.

A list of selected readings and other resources is included. The detailed glossary that defines many terms beyond the scope of this publication will further help the reader.