By Andrew J. Barker
Structured within the kind of a dichotomous key, resembling these generic in botany, the mineral key presents an effi cient and systematic method of making a choice on rock-forming minerals in thin-section. This new angle covers one hundred fifty+ of the main mostly 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 number of igneous, metamorphic, and sedimentary rocks, it additionally presents a accomplished atlas of rock-forming minerals in thin-section.
Commencing with a short advent to mineral structures, and the homes 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 id. To minimise the opportunity of misidentification, and permit much less skilled petrologists to take advantage of the foremost with self belief, the most important has been prepared to prioritise these houses 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 must also offer a priceless resource of reference for all practicing geologists facing rock thinsections and their interpretation.
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Additional info for A Key for Identification of Rock-Forming Minerals in Thin Section
Orange-brown Fe-staining along clv. traces (1i) ANKERITE (or Fe-Calcite, Siderite) PPL x70 (li) Ankerite (irregular porphyroblasts, showing ‘rusty’ alteration along cleavage) with quartz, chlorite and epidote in greenschist; Döllach, Austria (photo courtesy of Giles Droop). 90 No significant Fe-staining along cleavage traces 18 18 Some deformation twins (if present) bisect acute cleavage angle (1j) CALCITE XPL x100 (1j) Calcite (with deformation twins) in marble; Troms, Norway. 91 Some deformation twins (if present) bisect obtuse cleavage angle (1k) DOLOMITE XPL (1k) Dolomite in chl-talc-dol schist; Ghana 92 (Note: Magnesite (of serpentinites) is optically indistinguishable from calcite/dolomite).
24 R epresentative examples of length-fast and length-slow crystals; λ-plate inserted from NW in all cases. Isa region, Queensland, Australia. The staurolite (Fig. 24d), showed 1st order grey/white interference colours prior to insertion of the gypsum plate. With the plate inserted, and with length oriented NW-SE, it now shows its length-slow character, with lower colours (1st order yellow-orange) compared to the gypsum red, exactly the opposite of chloritoid and andalusite above. 6 Interference figures All previously described thin-section properties of minerals are observed in what is termed orthoscopic illumination.
21 shows examples of inclined extinction for actinolite (Fig. 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.