Optical Mineralogy: Principles And Practice by Colin D Gribble

By Colin D Gribble

Overlaying thought and perform, this wide-ranging introductory textbook covers the most optical houses of rock-forming minerals that may be well-known lower than the polarizing microscope. The authors elucidate the fundamental parts of microscopy, the idea of sunshine transmission via translucent minerals, and the houses of sunshine mirrored from opaque minerals. They speak about houses of the most silicate and non-silicate minerals, either translucent and opaque and the way the optical houses can be used to spot a mineral. The publication positive aspects many diagrams, precis tables, and 4 pages of colour illustrations, making it an excellent textbook in addition to an authoritative reference.

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Normal (see introduction). Moderate (Eck) to high (Arfv). oritic minerals . I w in both minerals but interference colours are frequently masked by mineral colours, especially in arfvedsonite. C HLORITE SILICATE MINERALS Chlorite *INTERFERENCE The colour of the minerals and their strong dispersion make interference FIGURE figures difficult to obtain , and these are usually indistinct with optic signs and size of 2V impossible to judge. *EXTINCTION Oblique with both minerals having variable extinction angles ; a ' cleavage varies from oo to 50° but this is also difficult to obtain .

10 shows the feldspar fields after prolonged cooling histories such as will occur in large plutons or in metamorphic rocks. K-feld par is restricted to low microcline and homogeneous plagioclases ar • restricted to nearly pure albite, anorthite An 85 _ , 00 and the compositional range from An 15 to An 70 , with all these having no more than aboul 2 mol % Or in the structure . The non-homogeneous types consist o f complex series of intergrowths of which three are important: peristeritcs (containing equal amounts of alkali feldspar and plagioclase) ; B~ggild 70 intergrowths (roughly from An 40 to An 60 ); and Huttenlocher intergrowths, from An 70 to An 85 • The B~ggild intergrowths can contain up to 6 % Or and are distinguished by labradorite iridescence (caused by the structure) .

Oxyhornblende, 0! yellow, {3 and 'Y dark brown. Kaersutite, ayellowish, {3 reddish brown , y dark brownish. Katophorite is strongly coloured in yellows, browns or greens, with a yellow or pale brown, {3 greenish brown or dark brown, and y greenish brown, red brown or purplish brown . In iron-rich varieties {3 andy become more greenish andy may be black. All minerals are negative with 2V. 020 2V. 16 H = SV2 /1 .. ffcleavage zoo to 54° katophorite oxyhornblende y"cleavage 0 to 19o { kaersutite SU MMARY OF PROPERTIES OCCUR RENCE Katophorite is very strongly coloured and pleochroic in yellows, browns and greens, and with 2V.

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