By Andrew J. Barker

Structured within the kind of a dichotomous key, resembling these familiar 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 global choice of igneous, metamorphic, and sedimentary rocks, it additionally offers a complete atlas of rock-forming minerals in thin-section.

Commencing with a short advent to mineral platforms, 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 extra relief mineral identity. To minimise the opportunity of misidentification, and let much less skilled petrologists to take advantage of the foremost 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 really is basically geared toward undergraduate and postgraduate scholars of mineralogy and petrology, yet also needs to offer a beneficial resource of reference for all training geologists facing rock thinsections and their interpretation.

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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.

Whilst this is true of all anisotropic minerals, the position at which extinction occurs varies from 22 A Key for Identification of Rock-forming Minerals in Thin-Section one mineral to the next as a function of crystal system and specific mineral properties. The extinction angle also varies from one crystal to the next as a function of crystal orientation in the plane of the thin section. It is easiest to define extinction in relation to elongate crystals and those with well developed cleavage and/or crystal faces (seen as flat edges in thin-section).

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.

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