By Andrew J. Barker
Structured within the type of a dichotomous key, akin to these general in botany, the mineral key offers an effi cient and systematic method of opting for rock-forming minerals in thin-section. This special approach covers a hundred and fifty+ of the main in general encountered rock-forming minerals, plus a couple of rarer yet noteworthy ones. Illustrated in complete color, with 330+ top of the range 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 quick advent to mineral platforms, and the houses of minerals in plane-polarised and cross-polarised mild, the mineral key additionally comprises line drawings, tables of mineral houses and an interference color chart, to extra reduction mineral identity. To minimise the opportunity of misidentification, and permit much less skilled petrologists to take advantage of the most important with self assurance, the most important has been prepared to prioritise these houses which are most simply recognised.
Designed for simplicity and simplicity of use, it's essentially aimed toward undergraduate and postgraduate scholars of mineralogy and petrology, yet also needs to offer a priceless resource of reference for all working towards 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
G. indicative of P-T conditions, m ore deposits or fluids). In some cases it may not be possible to key out specific minerals, since several minerals have very similar properties. In such cases the use of a microprobe or other analytical techniques may be necessary to determine the mineral. Section 1 2 (or 3) cleavage traces 36 A Key for Identification of Rock-forming Minerals in Thin-Section 1 3 CLEAVAGE TRACES 2 Cleavage traces 2 4 2 Isotropic3 Non-isotropic (c’less; 2 clv. at 93°; strong parting // 100) (1a) SPODUMENE ( ◻ ) PPL x100 100 (1a) Spodumene in granite; Leinster, Ireland 76 3 Colourless (or pale purple); (3 cleavage traces at 60–70°) (1b) FLUORITE PPL x100 Sps F1 (1b) Fluorite (arrowed) in hydrothermally altered garnet-rich quartzo-feldspathic metavolcanic rock; Nisserdal region, Telemark, Norway.
0°) (see Fig. 19). If the microscope eye-piece (ocular) contains N-S and E-W oriented cross-hairs this can be accurately determined; if not judgement by eye will be required. Similarly, length-section crystals showing a good cleavage trace (usually parallel to crystal edge), can also have their extinction angle easily determined. If the crystal goes into extinction with the cleavage trace N-S and E-W oriented, it too is said to show straight extinction (see vertically oriented central biotite crystal of Fig.
27 Schematic representation of biaxial mineral 2V angles for comparison to aid estimation of 2V for an unknown mineral. 85 (diagram created based on information in Ehlers, 1987a). 3 Maximum 2V value (at edge) where both isogyres can be observed in the field of view, as a function of Objective lens Numerical Aperture (NA) and average refractive index of the mineral (β). 9 53° 40° In cases that look like a cross, to prove that the crystal under consideration is a biaxial mineral with low 2V rather than a uniaxial mineral, rotation of the microscope stage should provide the necessary proof.
A key for identification of rock-forming minerals in thin-section by Andrew J. Barker