This book was written to share what Dr. Petruk had learned “… about the role, applications and benefits of applied mineralogy” since 1960, when he joined the Mineralogy Section of the Mineral Sciences Division at the Mines Branch, Department of Mines and Technical Surveys in Ottawa. At that time, besides expertise in identification and measurement of ore minerals by reflected-light microscopy, mineralogists relied heavily on X-ray diffraction as a determinative technique; consequently, two crystallographers worked closely with the mineralogists in what became arguably the best-equipped mineralogical laboratory in Canada during that period. However, as Dr. Petruk relates, an “… evolution...

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