Mi(ni)Geo

Carboniferous rocks - Cheverie, Bay of Fundy, Nova Scotia (by laszlofromhalifax)

Sulphur Crystals on Matrix (by cobalt123)

Sulphur Crystals on Matrix - A superb specimen of yellow sulphur crystals, well-formed and distinct on a matrix with white calcite crystals. This was shot through the glass display case at the Tucson Rock and Gem Show 2012.

Dead Horse Point State Park, Utah (by twiga_swala)

Marcia Bjornerud in “Reading the Rocks: The Autobiography of the Earth”. (via The Road To Endeavour)

California Desert 44 (by Adolfo Isassi)

The “magic” hour for canyons is not the same as the for open landscapes. It is different for every canyon. If I do not have the advantage of scouting the location beforehand, I use satellite imaging to see form above the canyon orientation relative to the traveling sunlight. Copyright: Adolfo Isassi.

The Grímsvötn crater lake formed during the May 2011 eruption. (via Dave McGarvie)

Sage geologic wisdom. (via @Taconic_Musings)

Giant’s Causeway (by fmhsu)

Basaltic lava in Laki volcano, Iceland. Credit: Petr Brož. (via Wikimedia Commons)

therockymineralshow:

Howlite

(Source: )

The Rock Food Table (by rockhoundsmovie)

No real food, just rocks. www.rockfoodtable.com

Earth from Space: Algerian sands (by europeanspaceagency)

This image shows the sandy and rocky terrain of the Sahara desert in western Algeria. With the Mediterranean Sea almost 500 km away, the closest town to the area pictured here is Taghit in the Algerian province of Béchar. The commercial Ikonos-2 satellite acquired this image on 23 April 2008 at a spatial resolution of 4 m. Credit: EUSI.

Structural Colors (by zeesstof)

The slightly odd angle of the pale aeolian rocks here is the result of the interaction between two big faults. The inclined block between them is, in this case, a Relay Ramp. Partly because of the faults and partly due to erosion of the altered rock, the sediments show a multitude of reds, greens and other colors here.

The Hawaiian Islands were formed as the Pacific Plate moved westward over a geologic hot spot. The most populous Hawaiian Island, Oahu, is dominated by two large shield volcanoes that range in age from two to four million years old. However, a fair number of smaller and much younger volcanic craters are also present on Oahu, such as Diamond Head Crater pictured above. These younger eruptions were also much smaller in lava output, and much more explosive in nature than the older shield lavas. The younger volcanic craters are all less than 500,000 years old. They formed after Oahu had moved well off the hot spot and the main shield volcanoes had gone dormant for at least two million years. For example, Oahu is now over 200 mi (320 km) from the still-active Kilauea, on the Big Island, consistent with the modern rate of plate motion of four inches (about 10 cm) a year. What caused these younger eruptions of the Honolulu Volcanic Series so long after the island had moved off the hot spot, their precise ages of eruption, and whether they will erupt again, are current points of research and debate among geoscientists. Photo taken on June 12, 2008. Credit: Charles W. Carrigan. (via EPOD)

Do you think there are enough Virginia geology nerds out there that I could sell these bumper stickers at a profit? (by Callan Bentley at Mountain Beltway)