Report On the Geology And Geography of the Northern Part of the East Africa Prot
Report On the Geology And Geography of the Northern Part of the East Africa Prot
John Parkinson
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Fig. B, form rather more than one half the slide, the remainder consisting of plagioclase usually faintly twinned or not at all, but with a refractive index considerably higher than balsam and belonging accordingly to the basic end of the series. Microcline is absent in this slide. Apatite is an accessory mineral. This and the sphene preceded the other minerals in consolidation; the epidote was slightly earlier than the garnet. In a somewhat similar rock from the same locality, in which green m...asses of epidote are the distinctive feature, the felspar is again difficult to determine, the majority of the crystals have a refractive index greater than that of quartz, while in others a lower figure indicates a more acid variety. The dominant epidote forms irregular polygonal crystals in bands which contain no other mineral except a few grains of sphene and rarely zircon, but occasionally open out round nests of felspar. Microcline is absent- Collected from the main track about one mile S. Of the camping ground known as Misa, some 12 miles from Moyale on the Abyssinian frontier, is a dark rock of close texture consisting of very pale pink garnets (in a thin section) and light browm hornblende in approximately equal proportions.
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