By Andrew J. Barker
Structured within the type of a dichotomous key, equivalent to these generic in botany, the mineral key presents an effi cient and systematic method of determining rock-forming minerals in thin-section. This new angle 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+ top of the range mineral photomicrographs from a global number of igneous, metamorphic, and sedimentary rocks, it additionally offers a entire atlas of rock-forming minerals in thin-section.
Commencing with a short creation to mineral platforms, and the houses 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 additional relief mineral identity. To minimise the opportunity of misidentification, and let much less skilled petrologists to take advantage of the major with self assurance, the major has been prepared to prioritise these houses which are most simply recognised.
Designed for simplicity and straightforwardness of use, it's basically geared toward undergraduate and postgraduate scholars of mineralogy and petrology, yet must also offer a useful resource of reference for all training 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
In such cases, when the microscope stage is rotated, each arm of the “cross” rotates into the field of view and out again in sequence (see Fig. 6–10 of Ehlers, 1987a). Such situations are normal and still of use, since by rotation of the stage the uniaxial character can still be confirmed. Having confirmed the uniaxial nature of the mineral, the next step is to determine the optic sign. This is done by inserting the gypsum “red” plate or quartz wedge. The choice depends on the appearance of the interference figure, which will vary according to the birefringence of the mineral.
Green interf. = interference L/W = length/width ratio of prismatic crystals met. = metamorphism Mod = moderate NA = Numerical Aperture (of objective lens) ord. = order pleochr. = pleochroism RI = refractive index RL = reflected light rlf. = relief x, y, z = crystallographic axes yell. 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.
G mid first order to second order). The quartz wedge, because of its tapered nature of gently increasing thickness produces interference colours from low first order to fourth order. carbonate minerals). It is standard for most microscopes to have the accessory plate insertion position as from NW or SE. Fig. 23 gives a schematic representation of a typical gypsum (λ) plate, with “fast” and “slow” orientation indicated (Fig. 23a). On insertion of the plate from the NW, a crystal oriented length-wise NW-SE, would be interpreted as “length-fast” if the interference colour increased on insertion of the plate (Fig.
A key for identification of rock-forming minerals in thin-section by Andrew J. Barker