This fascinating scarce text comprises a wonderfully detailed handbook on the subject of mineralogy. Considered by many to be the ultimate encyclopaedia of mineralogy, this text is very comprehensive and detailed, and has provided the basis for a plethora of other mineralogy and crystallography books. Intended to meet the requirements of class instruction, this text is highly accessible for beginners and constitutes a veritable must-have for anyone with an interest in the subject. Chapters contained herein include: Descriptive Crystallography, Mathematical Crystallography, Compound of Twin Crystals, Irregularities of Crystals, Pseudomorphous Crystals, and many more. Originally published in 1889, this scarce book has been elected for modern republication due to its immense educational value, and is proudly republished here complete with its original illustrations and a new introduction to the subject.