GeoLog

Geomorphology

Imaggeo on Mondays: A mineral under the microscope

Epidote, an abundant rock-forming mineral found in metamorphic rocks, nearly always appears in green, although it may vary in shade and tone. Under a microscope of polarized light, however, it exhibits strong pleochroism, that is, it shows different colors when observed at different angles. The thin section (a laboratory preparation of a mineral or rock sample for use with a polarizing microscope) ...[Read More]

Imaggeo on Mondays: Reflecting mountains in Sørfjorden, Norway

Located just southeast of Bergen on the Norwegian Atlantic coast, Hardangerfjorden is the third longest fjord in the world, measuring more than 170 km from the Atlantic Ocean to the Hardangervidda mountain plateau. Its longest branch, Sørfjorden, cuts 50 km from the main fjord and ends at Odda. Geormorphologist Martin Mergili visited the area in 2008, following the 33rd International Geological Co ...[Read More]

Imaggeo on Mondays: Open pit in Mirny, Siberia

This former open-pit diamond mine is currently the second largest excavated hole in the world. After diamond was discovered in there in 1955, the area became the first and largest diamond mine in the Soviet Union, producing up to 2,000 kg of diamond per year during the 1960s. Its surface operations continued until 2001 and the mine was permanently shut in 2011. This photo was taken on 22 July 2008 ...[Read More]

Imaggeo on Mondays: Huts in Arcachon Bay

Yann Vitasse, now a researcher at the Institute of Botany, University of Basel in Switzerland, got a wonderful present in 2009 for completing his PhD: a flight on an ultralight aircraft above the southwest coast of France. It was then he took this stunning photo of the Arcachon Bay, a water area near Bordeaux that is fed by the Atlantic Ocean and by a number of fresh waterways.“Here you see the fa ...[Read More]