By Andrew J. Barker
Structured within the type of a dichotomous key, similar to these regularly occurring in botany, the mineral key offers an effi cient and systematic method of settling on rock-forming minerals in thin-section. This new angle covers one hundred fifty+ of the main regularly encountered rock-forming minerals, plus a couple of rarer yet noteworthy ones. Illustrated in complete color, with 330+ prime quality mineral photomicrographs from a world selection of igneous, metamorphic, and sedimentary rocks, it additionally offers a entire atlas of rock-forming minerals in thin-section.
Commencing with a short creation to mineral structures, and the homes 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 reduction mineral identity. To minimise the opportunity of misidentification, and let much less skilled petrologists to take advantage of 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 basically geared toward undergraduate and postgraduate scholars of mineralogy and petrology, yet must also offer a necessary resource of reference for all practicing geologists facing rock thinsections and their interpretation.
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Additional resources for A key for identification of rock-forming minerals in thin-section
When measuring extinction of multiple lamellar twinned plagioclase, look for crystals with equal illumination when in N-S position relative to cross-wires (Fig. 22b), then rotate left and right in turn (Fig. 22a-c) to measure extinction angle of each twin set. If the crystal is to be regarded as reliable for extinction angle determination, the value obtained turning left should be the same or very close to the value obtained when turning right. In this example the extinction angle is 38° indicating the plagioclase in question is a Ca-rich labradorite (An68), bordering on bytownite.
In general end-sections close to perpendicular with the z-axis of the crystal and showing low birefringence are the best choice, and once again, deformed or heavily included crystals are best avoided. Having selected the crystal of interest, the same procedure as that described above, for uniaxial crystals, is undertaken. Assuming the crystal has a favourable orientation, when the Bertrand lens is inserted, if a well-centred interference figure is produced, the pattern observed will either be of two boomerang-like curved isogyres arching towards the centre of the field of view (Fig.
Colours. Weak c’less to pale grn. or yell. grn. -grn. to brownish pleochr. 2nd ord. blue to bright green interf. 029). Typical pyroxene of andesites and dacites. PIGEONITE( ◻ ) PPL Pigeonite (end-section) in andesitic pitchstone; Ardnamurchan, Scotland. x100 109 2V 56–84°; weak c’less to pale grn. pleochr. 1st ord. orange to 2nd ord. bright grn. iterf. 028). Typical pyroxene of eclogites. OMPHACITE( ◻ ) PPL An Fe-rich omphacite (end-section, with slight green to colourless pleochroism) with quartz and rutile in eclogite; Totaig, Glenelg, Scotland.