By Andrew J. Barker
Structured within the kind of a dichotomous key, similar to these conventional in botany, the mineral key presents an effi cient and systematic method of deciding on rock-forming minerals in thin-section. This special approach covers one hundred fifty+ of the main typically encountered rock-forming minerals, plus a number of rarer yet noteworthy ones. Illustrated in complete color, with 330+ prime quality mineral photomicrographs from a world choice of igneous, metamorphic, and sedimentary rocks, it additionally presents a complete atlas of rock-forming minerals in thin-section.
Commencing with a quick 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 id. To minimise the opportunity of misidentification, and allow much less skilled petrologists to exploit the main with self belief, the most important has been prepared to prioritise these houses which are most simply recognised.
Designed for simplicity and straightforwardness of use, it's essentially aimed 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 info for A key for identification of rock-forming minerals in thin-section
60° is relatively straightforward, as there is a regular relationship between the position and curvature of the isogyres (Fig. 27). This is based on the extent to which the apex of the curve arches towards the centre of the field of view, and how close the isogyres are to the edge. However, for minerals with 2V >60°, the angle is much harder to determine because in most cases, both isogyres will not usually be in the field of view together. Knowing the Numerical Aperture (NA) value of the objective lens being used is especially important when determining the 2V value for biaxial minerals (see below), as it influences the maximum 2V value where both isogyres are present in the field of view.
Orange interf. 016). Weak pink to grn. pleochr. HYPERSTHENE( ◻ ) (= En50Fs50 – En70Fs30 ) PPL Hypersthene in granulite; Hartmannsdorf, Saxony, Germany. x100 108 1st ord. orange to 2nd ord. grn. interf. 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.
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. (photo courtesy of Giles Droop). ). PPL Hedenbergite (end and side sections) in skarn; Camas Malag, Skye, Scotland. (Note: v. similar to augite). HEDENGERGITE( ◻ ) x100 111 Igneous rock (pale brown or greenish brown) 38 38 2V = 25–60° (biaxial +ve). Very common pyroxene in mafic and ultramafic AUGITE( ◻ ) igneous rocks.