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Journal of Emerging Trends in Engineering and Applied Sciences (JETEAS)

ISSN:2141-7016

Article Title: Economic Prospects of Nepheline Syenites Occurring Around Awo, Southwestern, Nigeria
by M. T. Jimoh and I. O. Raji

Abstract:
Nepheline syenites are purplish, iridescent intrusive igneous rocks of granitic composition that can be cut, trimmed and polished as dimension stones for various construction and decorative purposes. The rocks can also be a raw material for the manufacture of glass and ceramics. Other rock types that occur in association with the syenites include migmatite gneiss, biotite gneiss, quartzite, quartz schists, granite and pegmatite. Geological field mapping was conducted to collect rock samples and to ascertain the areal extent of the rocks. Other investigation carried out include cutting the thin sections of the five representative rock samples, cross examination of the thin sections under petrological microscope to comprehend and determine the petrographic characteristics of the various minerals present in the rock. This investigation is targeted at studying some physical and petrographic properties of the rock with a view to determining its functional and industrial application in dimension stone, glass and ceramic manufacturing among others. The petrographic examination carried out on the rock samples collected from the study area showed that nepheline syenite is made up of various minerals like Alkali feldspar (38.32%) plagioclase (9.11%), Nepheline (33%), Biotite (7.9%), Hornblende (6.71%), Quartz (3.31%) and accessory minerals (1.36%). Petrography also revealed the characteristic features of each constituent mineral like the cross hatched twinning in alkaline feldspar, polysynthetic twinning in plagioclase, pleochroic biotite and hornblende. The rock is very rich in feldspar and poor in quartz making it a suitable raw material in the manufacture of glass and ceramics. The colour and iridescent appearance make it useful in architecture, ornamentation, facade, monument and dimension stones. In order to achieve the Millenium Development Goals (MDGs) by creating wealth and alleviating poverty through structured and organised mining. The expansive rock deposits which are explorable and exploitable could be a source of generating huge revenue by setting up quarries, mining and mineral processing industries for the production of dimension stones, glass and ceramics manufacturing and various construction purposes.
Keywords: nepheline syenites, dimension stones, feldspar, iridescent, pleochroic
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ISSN: 2141-7016

Editor in Chief.

Prof. Gui Yun Tian
Professor of Sensor Technologies
School of Electrical, Electronic and Computer Engineering
University of Newcastle
United Kingdom

 

 

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