BASALT Basalt is an aphanitic igneous rock with less than 20% quartz and less than 10% feldspathoid by volume, and where at least 65% of the feldspar is in the form of plagioclase. Basalt features a glassy matrix interspersed with minerals. Basalt is defined by its mineral content and texture, and physical descriptions without mineralogical …
COBBLE Cobblestone is a kind of natural stone from the sandstone mountain which was formed by the river bed after the crustal movement happened in the tens of millions of years ago. They are squeezed and rubbed during the process of torrential flooding and water transportation. After many years, their irregular edges are rubbed …
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