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By Frederic Phillip Mennell

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50 diam. H= = 2 O. 5. Regular. not noticeably attacked by HC1, except when powdered does not gelatinize. Gives potassium flame colouration before the blow-pipe. Readily alters into analcime and other decomposition products. Leucite, Is ; . ; A MANUAL OF PETROLOGY 46 When fresh it is clear and colourless and crystallizes in trapezohedra, giving eight-sided, or, when imperfectly developed, rounded sections. The zoning by inclusions, which are disposed parallel to, or at right angles to, the faces, is very characteristic and often affords a ready means of identifying the mineral.

At 60 occasionally occur. Usually gives somewhat ragged lath-shaped sections. I. 72) double refraction moderate and negative, giving inter; I FIG. 25. green . V' - -^ --~1 FIBROLITE ENCLOSED IN CORDIERITE. Deep Bodenmais, Bavaria. Spinel also 'shown. X 30 diam. Extinction in basal ference tints of the first order. sections approximately parallel to the cleavage, and inclined to the twinning plane at angles up to 60. Both kyanite and andalusite are transformed into fibrous aggregates of fibrolite at a temperature of about 1350, the composition remaining unchanged.

The difference of its angles, however, from those of orthoclase is scarcely measurable though, on the other hand, its microscopic structure, as shown in polarised light, renders its distinction a matter ; Besides these, we have the group of plagioclases, readily discriminated for the most part from orthoclase, and microcline, but not so easily separated from one another, though such a separation is of great of the greatest ease. importance for classificatory purposes. Nevertheless, methods have been devised which enable a distinction to be made without great difficulty, in most instances, and some account of these is given below.

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A Manual of Petrology by Frederic Phillip Mennell


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