By Andrew J. Barker
Structured within the kind of a dichotomous key, akin to these favourite in botany, the mineral key presents 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 normally encountered rock-forming minerals, plus a number 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 complete atlas of rock-forming minerals in thin-section.
Commencing with a quick creation to mineral platforms, and the homes 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 reduction mineral identity. To minimise the opportunity of misidentification, and let much less skilled petrologists to exploit the main with self belief, the main has been prepared to prioritise these homes which are most simply recognised.
Designed for simplicity and simplicity of use, it really is essentially aimed toward undergraduate and postgraduate scholars of mineralogy and petrology, yet also needs to supply a invaluable resource of reference for all training 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
If the stage is rotated, slight movements in and out will prove the existence of two biaxial isogyres, whereas if there is no such movement the crystal under examination is uniaxial. 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.
21a) and plagioclase (Fig. 21b). When measuring extinction of multiple lamellar twinned plagioclase, look for crystals with equal illumination when in N-S position relative to cross-wires (Fig. 22b), then rotate left and right in turn (Fig. 22a-c) to measure extinction angle of each twin set. If the crystal is to be regarded as reliable for extinction angle determination, the value obtained turning left should be the same or very close to the value obtained when turning right. In this example the extinction angle is 38° indicating the plagioclase in question is a Ca-rich labradorite (An68), bordering on bytownite.
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.
A key for identification of rock-forming minerals in thin-section by Andrew J. Barker