By Andrew J. Barker
Structured within the type of a dichotomous key, corresponding to these established in botany, the mineral key offers an effi cient and systematic method of picking out rock-forming minerals in thin-section. This new angle covers one hundred fifty+ of the main in most cases encountered rock-forming minerals, plus a number of rarer yet noteworthy ones. Illustrated in complete color, with 330+ prime quality 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 creation to mineral structures, and the homes of minerals in plane-polarised and cross-polarised gentle, the mineral key additionally contains line drawings, tables of mineral houses and an interference color chart, to additional reduction mineral id. To minimise the opportunity of misidentification, and allow 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 simplicity of use, it's basically aimed toward undergraduate and postgraduate scholars of mineralogy and petrology, yet also needs to offer a precious resource of reference for all practicing 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
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) PPL Anthophyllite (end-section) in anthophyllitebt-grt gneiss; Finland. x100 79 Biaxial –ve (calc-silicate rocks, other Ca-Si-Fe rich rocks) XPL Tremolite (end-section) in calcareous semipelitic schist; Mangkuma-Ketempe, Ghana. ANTHOPHYLLITE(◻) 80 TREMOLITE(◻) x100 38 A Key for Identification of Rock-forming Minerals in Thin-Section 9 Blue/violet pleochroism, 1st ord.
X100 109 2V 56–84°; weak c’less to pale grn. pleochr. 1st ord. orange to 2nd ord. bright grn. iterf. 028). Typical pyroxene of eclogites. OMPHACITE( ◻ ) PPL An Fe-rich omphacite (end-section, with slight green to colourless pleochroism) with quartz and rutile in eclogite; Totaig, Glenelg, Scotland. (photo courtesy of Giles Droop). ). PPL Hedenbergite (end and side sections) in skarn; Camas Malag, Skye, Scotland. (Note: v. similar to augite). HEDENGERGITE( ◻ ) x100 111 Igneous rock (pale brown or greenish brown) 38 38 2V = 25–60° (biaxial +ve).
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