By Andrew J. Barker
Structured within the kind of a dichotomous key, equivalent to these established in botany, the mineral key presents an effi cient and systematic method of settling on rock-forming minerals in thin-section. This special approach covers one hundred fifty+ of the main as a rule 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 selection 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 houses of minerals in plane-polarised and cross-polarised gentle, the mineral key additionally comprises line drawings, tables of mineral houses and an interference color chart, to additional relief mineral id. To minimise the opportunity of misidentification, and allow much less skilled petrologists to take advantage of the major with self assurance, the most important has been prepared to prioritise these houses which are most simply recognised.
Designed for simplicity and straightforwardness of use, it's basically aimed toward undergraduate and postgraduate scholars of mineralogy and petrology, yet must also supply a worthy resource of reference for all working towards 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
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 igneous rocks.
This is why it is usually necessary to work at ×400 magnification. Another reason for working at high magnification is because of the requirement to have a very short working distance between the objective lens and the thin-section. This is needed so that on leaving the thin-section, the diverging cone of light is still reasonably tight, and so forms a sharp interference figure on the upper surface of the objective lens. The Numerical Aperture (NA) of the objective lens (usually marked on the side of the lens, along with magnification), is important, as it directly relates to the maximum angular spread of light rays that can be transmitted.
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. 1 TO DECIDE WHICH SECTION To use the key, firstly define whether the mineral is colourless or coloured in plane-polarised light, and whether it shows cleavage. If it is a cleaved mineral, it is necessary to define the number of cleavage traces present.
A Key for Identification of Rock-Forming Minerals in Thin Section by Andrew J. Barker