This book is a detailed examination of the optical properties of rock-forming minerals. It is designed to guide the novice through the fundamental principles of mineralogy and offers a deeper understanding of the subject for the experienced reader. The author encourages the study of these properties using a petrological microscope and other simple equipment. The book offers a comprehensive study of key mineralogical concepts such as light polarization, pleochroism, birefringence, and extinction, supported by accurate illustrations. It then applies these concepts to the analysis of doubly refracting minerals, and explores the ideas of interference and color production in doubly refracting media. By gradually introducing the reader to the field of mineralogy, this book serves as an accessible gateway to the subject and a useful guide for further exploration.

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