Abstract
Thin-sections of rocks allow petrology to be characterized at a microscopic scale and enable mineral identification to be made with greater confidence than in hand-specimens. This chapter examines the methods used to produce drawings of rocks and minerals in thin-section for the analysis and interpretation of petrology. Crystal or component shapes should be drawn first and it is useful to work outwards from a single object. Four worked examples of thin-section drawings are described to illustrate different tactics used in creating these diagrams. Practical advice on identifying minerals in thin-section and the optical properties of minerals is also given. Crystal orientation diagrams, useful in recording the optical properties of individual minerals, are also discussed.
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