By Andrew J. Barker
Structured within the type of a dichotomous key, equivalent to these familiar in botany, the mineral key offers an effi cient and systematic method of opting for rock-forming minerals in thin-section. This new angle covers a hundred and fifty+ of the main generally 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 number of igneous, metamorphic, and sedimentary rocks, it additionally offers a accomplished 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 gentle, the mineral key additionally contains line drawings, tables of mineral homes and an interference color chart, to additional relief mineral id. To minimise the opportunity of misidentification, and permit much less skilled petrologists to exploit the major with self assurance, the most important has been prepared to prioritise these homes which are most simply recognised.
Designed for simplicity and simplicity of use, it truly is essentially aimed toward undergraduate and postgraduate scholars of mineralogy and petrology, yet also needs to offer a priceless 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
If it is a cleaved mineral, it is necessary to define the number of cleavage traces present. Finally, it is necessary to determine whether the mineral has straight or inclined extinction. Once defined, use the list below to decide which Section to use to key-out the mineral. 2 Symbols & abbreviations (◻) = end-section ( ▮) = side-section (…) = small crystals (eg fine granules, inclusions); cleavage or other diagnostic properties not evident. // = parallel α, β, γ = optic axes (and refractive indices) δ = birefringence value Δ = retardation value +ve = positive - ve = negative 2V = optic axial angle birefr.
40–45°) extinction (1p)26 (1p) Extinction // to cleavage (1q)39 (1q) 26 1st order grey/white interference colours Interference colours above 1st ord. grey/white 27 28 46 A Key for Identification of Rock-forming Minerals in Thin-Section ENSTATITE( ◻ ) 27 Mafic/ultramafic rock XPL Enstatite (end and side sections) in boninite; Chichijima, Bonin Islands, Japan. 100 ANDALUSITE( ◻ ) Meta-pelite/mudrock (Al-rich) PPL Andalusite (end-section) in crd-and slate; Connemara, Ireland. x50 x50 101 28 Colourless29 Weakly or strongly coloured in PPL 32 DIOPSIDE( ◻ ) 29 Calc-silicate rock/marble/skarn XPL Diopside in calc-silicate skarn; Loch Ailsh, Assynt, Scotland.
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.