By Andrew J. Barker
Structured within the kind of a dichotomous key, corresponding to these normal in botany, the mineral key presents an effi cient and systematic method of deciding upon rock-forming minerals in thin-section. This special approach covers a hundred and fifty+ of the main quite often encountered rock-forming minerals, plus a number of rarer yet noteworthy ones. Illustrated in complete color, with 330+ prime quality mineral photomicrographs from a global number of igneous, metamorphic, and sedimentary rocks, it additionally presents a accomplished atlas of rock-forming minerals in thin-section.
Commencing with a short advent to mineral structures, and the houses of minerals in plane-polarised and cross-polarised mild, the mineral key additionally contains line drawings, tables of mineral houses and an interference color chart, to additional relief mineral identity. To minimise the opportunity of misidentification, and let much less skilled petrologists to exploit the main with self belief, the major has been prepared to prioritise these homes which are most simply recognised.
Designed for simplicity and simplicity of use, it truly is essentially aimed toward undergraduate and postgraduate scholars of mineralogy and petrology, yet must also supply a invaluable resource of reference for all training geologists facing rock thinsections and their interpretation.
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Extra info for A key for identification of rock-forming minerals in thin-section
Likewise, in Kerr (1977), Tables 10–9 and 10–10 and Charts A–G provide similar data. There are advanced techniques described by Ehlers (1987a) for estimation of the 2V angle for minerals with high 2V (isogyres outside the field of view), but these go well beyond what can reasonably be addressed in the present publication. In the present mineral key, whenever 2V angle forms the final discriminator for two closely similar minerals it is often just a case of deciding whether the 2V angle is low or high that is needed, so obtaining a more precise estimate is not usually crucial.
E. plagioclase [mid grey 1st Ord. ]) in augen gneiss; Bettyhill, Tongue, Scotland. 013 (yellow) for Bytownite and Anorthite. st Plagioclase (labradorite) in troctolite; Sierra Leone. XPL 117 x50 Section 2: 1 Cleavage trace, inclined extinction 55 3 Max. Extinction angle < 12° (2d) OLIGOCLASE Max. Extinction angle >12°4 12° - 27° 0° - 12° 27° - 40° (2e) (2d) (2f) 4 Max. Extinction angle 12–27° (2e)5 Max. Extinction angle >27°6 5 Low +ve relief Low –ve relief ANDESINE ALBITE 6 Max. 009) LABRADORITE Max.
A) orientation of accessory plate at point of insertion varies between microscopes, many have the plate inserted NW-SE. Fast and slow vibration directions indicated; b) for length-fast crystals, when the plate is inserted as shown, with the crystal aligned with its “fast” orientation parallel to the “fast” direction of the plate (left), the interference colours of the mineral will be observed to increase. With the crystal oriented with its “fast” orientation (length) at 90° to the inserted plate (right), the interference colours will be lower; c) length-slow crystals show the reverse relationship, with crystals aligned with their “slow” direction parallel to the “fast” direction of the inserted plate showing a decrease in interference colours, whilst at 90° to this the crystal shows higher colours.
A key for identification of rock-forming minerals in thin-section by Andrew J. Barker