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

By C. D. Gribble

Microscopy is a servant of the entire sciences, and the microscopic examina­ tion of minerals is a crucial method which may be mastered by means 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 should still change those yet that it's going to function an introductory textual content or a primary stepping-stone to the examine of optical mineralogy. the current textual content has been written with complete wisdom 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 give a scientific clarification of using the microscope in addition to theoretical facets of optical mineralogy. The e-book is as a result compatible for the amateur both learning as somebody or engaging in classwork. either transmitted-light microscopy and reflected-light microscopy are handled, the previous concerning 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 significance in undergraduate classes on ore mineralisation, however the major reason behind combining the 2 facets of microscopy is that it's 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 research of polished skinny sections.

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Moderate. Straight on single cleavage trace. 39 SILICATE MINERALS 'INTERFERENCE FIGURE 'OTHER FEAT U RES 'OCCURREN CE Basal section gives an excellent BXa (+ve) figure with a small 2V. Note that basal sections are usually small, so a very high power objective lens will give the best figure (X55 or more). In high grade regionally metamorphosed rocks the fibrous sillimanite (formerly called fibrolite) is usually found associated with biotite, appearing as long thin fibres growing within the mica crystal.

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. Moderate to high. Common (see introduction).

Mm2 The subscript 100 may be omitted as this is the standard load. mm2 this is also often omitted. The determination of hardness is a relatively imprecise technique, so an average of several indentations should be used. Tables of VHN usually give a range in value for a mineral, taking into account variations due to compositional variations, anistropy of hardness and uncertainty. Brittleness, plasticity and elasticity control the shape of the indentations, and as the shape can be useful in identification the COM recommends that indentation shape (using the abbreviations given in Fig.

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