By C. D. Gribble
Microscopy is a servant of all of the sciences, and the microscopic examina tion of minerals is a crucial process which can be mastered through all scholars of geology early of their careers. complex glossy textual content books on either optics and mineralogy can be found, and our purpose isn't that this new textbook should still substitute those yet that it may 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 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 give a scientific clarification of using the microscope in addition to theoretical elements of optical mineralogy. The e-book is as a result compatible for the beginner both learning as somebody or partaking 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 regarding 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 elements of microscopy is that it's not applicable to overlook opaque minerals within the systematic petrographic research of rocks. twin function microscopes incorporating transmitted- and reflected-light modes are on hand, and those are perfect for the examine of polished skinny sections.
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Extra info for A Practical Introduction to Optical Mineralogy
Represented by kaolinite - serpentine is similar with a B layer replacing the G layer A type \ / I 7 I \ G or B 3 layer unit (2 tetrahedral and 1 octahedral; called a 2 : 1 type) alkali atoms here - K, Na, etc. \ next 2 : 1 unit I (2) 10 A type with muscovite, illite and montmorillonite having G octahedral layers, and biotite B layers: the three layer units are joined together by monovalent alkali ions. Montmorillonite may not possess any atoms in this plane and may have an overall negative charge.
Galena (C), appear white. Holes, pits and cracks appear black. Note the black triangular cleavage pits in the galena and the abundant pits in the barite which results, not from poor polishing, but from the abundant fluid inclusions. Scratches appear as long straight or curving lines. They are quite abundant in the galena which is soft and scratches easily. (c) (d) (e) (f) (g) 18 Holes, pits, cracks and specks of dust appear black. Reflection from crystal faces in holes may give peculiar effects such as very bright patches of light.
101), and obtain an optic axis figure which will be negative. Crystals in metamorphic rocks are usually poikiloblastic, and full of quartz inclusions. See after sillimanite. 016 0 2Va = 82° -ve OAP is approx. 65 H = 5'11 -7 no n~ COLOUR PLEOCHROISM HABIT Usually colourless in thin section but may be pale blue. Weak but seen in thick sections with ex colourless, f3 and)' blue. Usually found as subhedral prisms in metamorphic rocks. e. broad in one direction but thin in a direction at right angles to this.