This book presents an overview of the chemistry, geology, toxicology and environmental impacts of arsenic, presenting information on relatively common arsenic minerals and their key properties. In addition, it includes discussions on the environmental impacts of the release of arsenic from mining and coal combustion. Although the environmental regulations of different nations vary and change over time, prominent International, North American, and European guidelines and regulations on arsenic will be reviewed. This work includes information on recent environmental catastrophes (e.g. Bangladesh and China). It offers a thorough discussion of the arsenic cycle, including the cosmological origin of arsenic. It also includes Appendices providing extensive glossary and measurement conversion tables.