By Andrew J. Barker
Structured within the kind of a dichotomous key, similar to these regular 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 in general encountered rock-forming minerals, plus a couple 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 presents a entire atlas of rock-forming minerals in thin-section.
Commencing with a quick advent to mineral structures, and the homes of minerals in plane-polarised and cross-polarised gentle, the mineral key additionally comprises line drawings, tables of mineral homes and an interference color chart, to extra reduction mineral id. To minimise the opportunity of misidentification, and let much less skilled petrologists to take advantage of the foremost with self assurance, the foremost has been prepared to prioritise these houses which are most simply recognised.
Designed for simplicity and straightforwardness of use, it really is basically geared toward undergraduate and postgraduate scholars of mineralogy and petrology, yet must also supply a useful 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
Brn. to dark chestnut brown pleochroism. 2V = 44–90°. brown HORNBLENDE (Oxo-HORNBLENDE)(◻) PPL Oxo-hornblende phenocryst in andesite; Plomb du Cantal, France. x100 85 Note: The black iron-oxides often seen around the edge of Oxo-hornblendes result from resorption effects. , 2013). -brn to red-brn. pleochrosim. 2V = 74–82°. KAERSUTITE(◻) (previously called BARKEVIKITE) PPL Kaersutite phenocrysts in syenogabbro (“lugarite”); Lugar Sill, Lugar, Ayrshire, Scotland. -green-blue-grn. However, high temperature hornblendes may be green to brown, or brown pleochroic.
26c), or else something that looks very like a uniaxial cross (Fig. 26a). The latter occurs in cases where the 2V angle (optic axial angle) is very low (0–10°), whereas the latter forms with higher 2V values. 596 73 (b) Phlogopite with λ-plate inserted (biaxial –ve) (2V=0–10°). 26 Biaxial minerals (magnification x400 in all examples); a) Phlogopite with low 2V angle (0–10°) shows what at first glance appears to be a “uniaxial cross”, but on rotation the two isogyres fluctuate in and out slightly revealing that the crystal is actually a biaxial mineral with very low 2V; b) is the same field as shown in a), but with the λ-plate inserted.
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. In fact, it is slightly more complicated than this, because the β-index (intermediate refractive index of the mineral) also has an effect.