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Basalt is a common extrusive igneous rock formed by the rapid cooling of basaltic lava exposed at or very near the surface of Earth
From Late Latin Basaltes (variant of basanites ), very hard stone, which was imported from Ancient Greek Basanites
Durable Rock, Medium Hardness Rock
Fine Grained Rock, Opaque Rock
Borolanite is a variety of Nepheline Syenite and belongs to igneous rocks and contains nepheline-alkali feldspar pseudomorphs which occur as conspicuous white spots in the dark rock matrix
From Alkalic Igneous complex near Loch Borralan in northwest Scotland
Durable Rock, Medium Hardness Rock
Fine Grained Rock, Opaque Rock