By Frederic Phillip Mennell

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Fibrolite . . Anthophyllite . . . . " trating the tints in Levy and Lacroix's t Variable often very weak, sometimes, indeed, the mineral is perfectly isotropic. A MANUAL OF PETROLOGY 20 Third Order. Violet Scapolite (variable)* Olivine ... Blue Yellow Epidote . . . Biotite . Muscovite Talc ... Pink . . Fourth Order. Zircon Green White ,, . . . Cassiterite (variable) ... Sphene ... Calcite and Dolomite Rutile In the above table there is no mention of the minerals Some members, crystallise in the regular system.

Sometimes contains soda. Varieties containing lithium and fluorine have been termed lepidolite and zinnwaldite. They may be recognised by their red lithium flame colouration. Muscovite is not subject to K = H= . decomposition. In sections it is transparent and colourless to light green, Not pleochroic. Crystallizes in pinkish, or yellowish. flat plates, the basal planes being the best developed faces. Basal sections are hexagonal, and vertical sections lathshaped, showing the very perfect basal cleavage, and giving straight extinction.

A MANUAL OF PETROLOGY CHAPTER The Aluminous V. Silicates. THE most important of the rock-formers belong to the class of silicates which are rich in alumina. Where the alumina is accompanied by the alkalies, or lime, or both, we have minerals belonging to the felspar or felspathoid groups. The other highly aluminous silicates comprise some important contact minerals, far more restricted in their occurrence, however, than the felspars, while we may also include as somewhat aberrant members of the group which is a lime alumina silicate and chloride, and those micas into the constitution of which iron and magnesia This grouping is one to which exception scarcely enter.

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