By Andrew J. Barker
Structured within the kind of a dichotomous key, equivalent to these commonly used in botany, the mineral key offers an effi cient and systematic method of opting for rock-forming minerals in thin-section. This special approach covers one hundred fifty+ of the main usually 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 choice of igneous, metamorphic, and sedimentary rocks, it additionally offers a entire atlas of rock-forming minerals in thin-section.
Commencing with a quick 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 homes and an interference color chart, to extra reduction mineral id. To minimise the opportunity of misidentification, and allow much less skilled petrologists to exploit the major with self belief, the most important 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 supply a beneficial resource of reference for all working towards 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
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. -greenish brown pleochroism is difficult to distinguish from brown hornblendes. Also consider AENIGMATITE, a very dark brown, high relief almost isotropic mineral of nepheline and sodalite syenites. Its extinction angle is 66˚. 67–75° (≡ 113–105°) Cleavages at > 75° 15 19 15 Isotropic (usually 2 feint clv.
At this position the crystal will show maximum intensity of interference colour. If we take the case of a mineral showing straight extinction, the crystal would be rotated to either the NW-SE or NE-SW position. The next step is to insert a mica (λ/4) plate (retardation Δ = 150 nm), a gypsum (λ) plate (Δ = 550 nm) or a quartz wedge (typically ranges from Δ = 0–50 nm up to Δ = 2200 nm). The retardation due to the quartz wedge increases progressively with increasing thickness of the wedge (see Kerr, 1977, for further detail).
33 34 TITANAUGITE( ◻ ) x50 107 34 Weakly pleochroic 35 Non-pleochroic37 Section 1: 2 (or 3) cleavage traces 49 35 Max 1st ord. /orange interf. 016). Weak pink to grn. pleochr. HYPERSTHENE( ◻ ) (= En50Fs50 – En70Fs30 ) PPL Hypersthene in granulite; Hartmannsdorf, Saxony, Germany. x100 108 1st ord. orange to 2nd ord. grn. interf. colours. Weak c’less to pale grn. or yell. grn. -grn. to brownish pleochr. 2nd ord. blue to bright green interf. 029). Typical pyroxene of andesites and dacites. PIGEONITE( ◻ ) PPL Pigeonite (end-section) in andesitic pitchstone; Ardnamurchan, Scotland.
A key for identification of rock-forming minerals in thin-section by Andrew J. Barker