Basalt
Videos
Basalt; US: buh-SALT is an aphanitic extrusive igneous rock formed from the rapid cooling of low-viscosity lava rich in magnesium and iron exposed at or very near the surface of a rocky planet or moon
Basalt 12
QAPF diagram with basalt/andesite field highlighted in yellow. Basalt is distinguished from andesite by SiO2 < 52%.
Vesicular basalt at Sunset Crater, Arizona. US quarter (24mm) for scale.
Columnar basalt flows in Yellowstone National Park, US
Giant's Causeway
Videos
The Giant's Causeway is an area of approximately 40,000 interlocking basalt columns, the result of an ancient volcanic fissure eruption, part of the North Atlantic Igneous Province active in the regio
Basalt
…described by Pliny the Elder in AD 77 in Naturalis Historiae. Types Large masses must cool slowly to form a polygonal joint pattern, as here at the Giant's Causeway in Northern Ireland Columns of basalt near Bazaltove, Ukraine On Earth, most basalt is formed by decompression melting of the mantle. The high pressure…
The Giant's Causeway
Engraving of Susanna Drury's A View of the Giant's Causeway: East Prospect, 1768
Red basaltic prisms
Giant's Causeway at sunset