Geo-trekking in Ethiopia's Tropical Mountains: The Dogu'a Tembien District — illustration 1, PDF page 166
Source record
- Source
- Habesha History book corpus — Geo-trekking in Ethiopia's Tropical Mountains: The Dogu'a Tembien District
- Book
- Geo-trekking in Ethiopia's Tropical Mountains: The Dogu'a Tembien District
- Source reference
- Geo-trekking in Ethiopia's Tropical Mountains: The Dogu'a Tembien District; PDF page 166; embedded illustration 1, exact source rectangle 56.52, 197.29, 363.1, 418.68
- Page
- 166
- Publication year
- 2019
- Type
- Book illustration
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Source-page captions
Fig. 9.4 Petrography of the volcanic rocks of Hagere Selam area, showing various mineralogical and textural features. All images are taken under crossed polars with a magnification of 40 to 125. a Fine-grained groundmass of plagioclase and pyroxene imbedding coarse-grained plagioclase phenocrysts; b fine-grained elongated plagioclase and weakly developed crystal faces of pyroxenes; c coarse-grained (equigranular) elongated and in some cases, well developed-crystal faces with mineral flow band of K-feldspars are the main constituents. Most of the plagioclase phenocrysts show twinning (two crystal face); d Phenocrysts of nepheline and skeletal texture pyroxene with some sodic pyroxenes, and some early crystallized feldspars
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