GMPV
Geochemistry, Mineralogy, Petrology & Volcanology
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Metwally Hamza

Egyptian Geologist

Photos-supported and References-based Guide on Gemstones and Semi-gemstones Focusing on their Impacts and Uses in the Ancient Egyptian Civilization

March 20, 2025
Photos-supported and References-based Guide on Gemstones and Semi-gemstones Focusing on their Impacts and Uses in the Ancient Egyptian Civilization
Epidote Semi-gemstone Occurrence. ©Metwally Hamza

Geology is more than just studying rocks and minerals; it is also about learning everything you can about the past, studying the present, and finally predicting the future, making the most of your human edition ━ Metwally Hamza. . . .   . . .   . . . “I dedicate this guide and topic to my dear professor Dr. Zakaria Hamimi, who inspires me with his achievements.” . . .   . . .   . . . G ...[Read More]

Granite Rocks: Mineralogy, Geochemistry, Textures, Types, Main Varieties, Uses, and More

March 13, 2025
Granite Rocks: Mineralogy, Geochemistry, Textures, Types, Main Varieties, Uses, and More
Two facies of G3-granite with columnar joints. ©Metwally Hamza

Granite is a coarse-grained, crystalline, plutonic, felsic, and acidic igneous rock. It contains more than 66% of silica “SiO2”, and about 14.42% of alumina “Al2O3”. The quartz makes up 10% : 50% of the whole rock. The alkali feldspars range from 65% to 90% of the entire rock. It’s leucocratic “light-colored”. The equivalent volcanic rock of granite is rhyolite. The melting point of most dry grani ...[Read More]