Maps And Scientific Reports.

Cover Maps And Scientific Reports.
Maps And Scientific Reports.
Conway, William Martin, Sir, 1856-1937
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132.
Digitized by Google COLLECTION OF BOCK SPECIMENS. 51 Felstones.
The collection contains few of the more compact acid igneous rocks. Normal specimens are almost absent, bat a series from the vicinity of the Golden Throne may be best noticed here. The rocks [291] [292] [293] from the moraine starting from the west foot of the mountain are compact, but show a schistose structure with slightly micaceous or talcose aspect, indicative of crushing. They are particoloured, a grey, varying from sli
...ghtly to markedly greenish, being streaked, spotted, and blotched with a dull indian red, small white specks showing in some of the patches. The texture of the lighter part under the microscope is speckled, or somewhat fibrous, with indications of minute aggregate polarisation, this being most conspicuous when it makes an angle of 45° with he vibration planes of the crossed nicols. The mineral very closely resembles the so-called sericite of some porphyroids. Here and there are grains of quartz, decomposed and sometimes broken felspar crystals, and some dark reddish, flaky patches.

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