A Manual of Petrology by Frederic Phillip Mennell

By Frederic Phillip Mennell

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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.

Strongly magnetic, being readily separable from other constituents of a rock by applying a magnet to the powder. Weathers to haematite or limonite. Opaque in the thinnest sections greyish metallic lustre by reflected light. It occurs in octahedra, or as granules, FIG. 15. SKELETON CRYSTAL OF MAG- sometimes in shape. H= . a w lyo te> very irregular forms skeleton crystals. no cleavSometimes twinned on O Occasionally : age traces. I. very high. Occurs in nearly all the igneous rocks, and is widely also found in sands, distributed in the metamorphic ones ; sandstones, etc.

Rhodesia. + nicols. X 60 diam. Straight extinction. in schist, Frequently occurs in contact meta- morphic rocks, largely as inclusions in the other minerals, but sometimes in fibrous patches, or lenticular aggregates. Staurolite. 5. Not with water. Orthorhombic. H j\. affected by acids, and resists weathering. = In thin sections it is colourless to yellowish, reddish, or brownish. Forms short prisms (angle 130) bounded by a , prism (no) and basal plane (ooi). These are occasionally A MANUAL OF PETROLOGY 52 by other faces, so that it shows rectangular, and hexagonal sections.

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