mohs hardness for basalt rock

Geology Dig deeper into geology by learning about everything from ancient fossils to the landslides and earthquakes of today. Rocks & Minerals Definitions Feldspar Feldspar refers to a group of minerals containing aluminum and silica.They all show good cleavage in two directions at about 90 degrees. The hardness is about 6 and the specific gravity between 2.5 - 2.8. Ferberite Ferberite has the formulae FeWO4 - . Introduction to Geology "Every Rock Has A Story" Rocks are composed of chemical compounds naturally occurring in nature. Rocks are composed of particles ranging from microscopic grains to full sized crystals and crystal grains of different kinds of minerals, and containing many different identifiable physical characteristics.    Read More

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