By Frederic Phillip Mennell
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203 Iron has been detected in basalt at Ovifak in Greenland, minute grains in the Antrim flows, and in the olivine it also occurs rock of New Zealand abundantly in most meteorites, always in the form of an alloy with nickel, which shows characteristic etched figures when a polished surface is treated with dilute acids, or preferably with bromine water. in ; A MANUAL OF PETROLOGY 30 OXIDES. 65. *? ''' 4 * NlCKEL-lRON OF THE TOLUCA METEORITE. Etched to show Widmannstaten's figures. FlG. 12. composition.
Nicols. X Crossed 15 diam. EFFECTS OF TWINNING. Polarised light, when applied to rock slices, often reveals the structure known as twinning, even in minerals which give no indication of This is simply due to the fact it in their external form. that the interference tints vary according to the direction of section, and that in nearly all cases the individuals of a twin therefore differ in tint. For determinative purposes It may this fact may be made use of in various ways. serve as an aid to ascertaining the system of crystallisation external form, or, in other cases, from its relation to the may be of great assistance in identifying the particular In some cases repeated or lamellar twinning is mineral.
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.
A Manual of Petrology by Frederic Phillip Mennell