A Practical Introduction to Optical Mineralogy - download pdf or read online

By C. D. Gribble

ISBN-10: 9401178046

ISBN-13: 9789401178044

ISBN-10: 9401178062

ISBN-13: 9789401178068

Microscopy is a servant of all of the sciences, and the microscopic examina­ tion of minerals is a crucial process which may be mastered by way of all scholars of geology early of their careers. complicated sleek textual content­ books on either optics and mineralogy can be found, and our goal isn't really that this new textbook may still substitute those yet that it's going to function an introductory textual content or a primary stepping-stone to the learn of optical mineralogy. the current textual content has been written with complete understanding that it'll most likely be used as a laboratory guide, serving as a short connection with the houses of minerals, yet however care has been taken to provide a scientific rationalization of using the microscope in addition to theoretical elements of optical mineralogy. The ebook is hence appropriate for the beginner both learning as somebody or partaking in classwork. either transmitted-light microscopy and reflected-light microscopy are handled, the previous related to exam of obvious minerals in skinny part and the latter related to exam of opaque minerals in polished part. Reflected-light microscopy is expanding in value in undergraduate classes on ore mineralisation, however the major explanation for combining the 2 points of microscopy is that it really is now not appropriate to overlook opaque minerals within the systematic petrographic examine of rocks. twin objective microscopes incorporating transmitted- and reflected-light modes are available, and those are perfect for the learn of polished skinny sections.

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Usual amphibole cleavages (see introduction). Partings parallel to {100} and {001} may also be present. Moderate to high. See introductory section. Moderate: maximum interference colours are low second order blues, but these are frequently masked by the body colour, especially if the hornblende is an iron- or sodium-rich variety. INTERFERENCE • FIGURE ) Similar to tremolite-actinolite EXTINCTION • . ANGLE mtroductIOn). TWINNING 49 with extinction angle y'cl up to 30° (see SILICATE MINERALS 'OCCURRENCE Common hornblendes are primary minerals, particularly in intermediate plutonic igneous rocks, although they can occur in other types.

Amosite (brown asbestos) is asbestiform grunerite. 017 2V. 44 H = 5-6 n. n# ny COLOUR 'PLEOCHROISM HABIT 'CLEAVAGE RELIEF ALTERATION BIREFRINGENCE INTERFERENCE FIGURE Colourless to pale green (tremolite). Ferroactinolite is pleochroic in shades of green. Related to iron content - the more iron rich, the more pleochroic the mineral, with ex pale yellow, f3 yellowish green, y greenish blue. Elongate prismatic with aggregates of fibrous crystals also present. The usual prismatic cleavages { 110} and intersecting at 56° on the basal plane.

11 Sections. Cutting the sample with a diamond saw. Mounting the sample on glass or in a cold-setting resin . m thick polished surface 3cm 28 THIN- AND POLISHED-SECTION PREPARATION (3) (4) (5) Grinding the surface fiat using carborundum grit and water on a glass or a metal surface. Polishing the surface using diamond grit and an oily lubricant on a relatively hard 'paper' lap. Buffing the surface using gamma alumina powder and water as lubricant on a relatively soft 'cloth' lap. There are many variants of this procedure, and the details usually depend on the nature of the samples and the polishing materials, and equipment that happen to be available.

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A Practical Introduction to Optical Mineralogy by C. D. Gribble


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