The fourth edition of Introduction to Mineralogy combines material now covered in both traditional and optical mineralogy courses and focuses on describing minerals within their geologic context. Introduction to Mineralogy is suitable as a primary or supporting text for mineralogy, optical mineralogy, petrology, earth materials, and/or economic geology courses. It presents the important content of mineralogy including crystallography, chemical bonding, controls on mineral structure, mineral stability, and crystal growth to provide a foundation that enables students to understand the nature and occurrence of minerals.