Download A key for identification of rock-forming minerals in by Andrew J. Barker PDF

By Andrew J. Barker

Structured within the type of a dichotomous key, reminiscent of these commonplace in botany, the mineral key offers an effi cient and systematic method of settling on rock-forming minerals in thin-section. This special approach covers a hundred and fifty+ of the main typically 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 global selection of igneous, metamorphic, and sedimentary rocks, it additionally offers a finished atlas of rock-forming minerals in thin-section.

Commencing with a short advent to mineral platforms, and the houses of minerals in plane-polarised and cross-polarised mild, the mineral key additionally comprises line drawings, tables of mineral houses and an interference color chart, to additional relief mineral identity. To minimise the opportunity of misidentification, and let much less skilled petrologists to exploit the foremost with self assurance, the main has been prepared to prioritise these homes 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 also needs to supply a worthwhile resource of reference for all practicing geologists facing rock thinsections and their interpretation.

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Extra resources for A key for identification of rock-forming minerals in thin-section

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At 93°; strong parting // 100) (1a) SPODUMENE ( ◻ ) PPL x100 100 (1a) Spodumene in granite; Leinster, Ireland 76 3 Colourless (or pale purple); (3 cleavage traces at 60–70°) (1b) FLUORITE PPL x100 Sps F1 (1b) Fluorite (arrowed) in hydrothermally altered g­arnet-rich quartzo-feldspathic metavolcanic rock; Nisserdal region, Telemark, Norway. -brn. or brown (1 strong clv. + intersecting partings) (1c) PPL (1c) Sphalerite in Zn-ore deposit; Zinkgruvan, Sweden. /2nd ord.  7 GRUNERITE (◻) 7 Symmetrical extinction “diamond”-shaped (1d) Symmetrical extinction “truncated diamond”-shaped (1e) CUMMINGTONITE( ◻ )  (1d) 8 (1e) 8 Biaxial +ve (meta-ultramafics, other Mg-Fe rich rocks) ANTHOPHYLLITE(◻) PPL Anthophyllite (end-section) in anthophyllitebt-grt gneiss; Finland.

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. 13a,and stilpnomelane of Fig. 19a). 19 Minerals showing straight extinction. a) Stilpnomelane (note lower left E-W crystal and central N-S crystals at extinction), in metamorphosed siliceous ironstone; Laytonville Quarry, California, USA; b) Radiating tourmaline crystals in Luxullyanite; Cornwall, England.

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.

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