Columnar Basalt Revealing Hexagonal Structure Iceland
The mineralogy of basalt is characterized by a preponderance of calcic plagioclase feldspar and pyroxene. Olivine can also be a significant constituent. Accessory minerals present in relatively minor amounts include iron oxides and iron-titanium oxides, such as magnetite, ulvospinel, and ilmenite. Because of the presence of such oxide minerals, basalt can acquire strong magnetic signatures as it cools, and paleomagnetic studies have made extensive use of basalt.
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Location: Iceland
Photo credit: © Phil Degginger / Alamy / Afripics
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Keywords: basalt, columnar, columns, crystal, crystals, formation, geology, hexagonal, iceland, icelandic, igneous, rock, structure, vulcanism
