The Seven Sisters are a series of chalk cliffs by the English Channel, in Sussex (doh!). In case you didn’t know, chalk is actually a porous sedimentary rock, a form of limestone composed of the mineral calcite forming in somewhat deep underwater conditions from the gradual accumulation of minute calcite plates (coccoliths) shed from micro-organisms called coccolithophores. The southern and
Originally described from Turjinskii Mine (Turginsk Mine) in Russia, turgite is generally considered a variety of two more common minerals – goethite and hematite. Turgite is a mixture of the two minerals due to the alteration of goethite, typically found in the botryoidal (globular) habit of the “parent” goethite; however, because it is a mixture of two minerals, it is not considered a
This beautiful formation is made up of three mineral: Chalcopyrite (green), Galena (purple) and Dolomite (gray).
Today, we have more pictures… because I just couldn’t limit myself to one. Olivier Grunewald, a well known French photographer traveled the world to capture these stunning images of volcanic eruptions.
Clinoptilolite is a natural zeolite comprising a microporous arrangement of silica and alumina tetrahedra. These zeolite crystals form when volcanic molten lava meets the sea. This chemical reaction creates a crystal with a cage-like, porous structure and negative charge, making it one of the rare, negatively-charged minerals in nature. Engineers have been exploiting this feature, using zeolites as filters for
Strengite is a rare mineral, named after Johann August Streng, a professor of Mineralogy at University of Giessen, Germany, in the late 1800s. Streng was an assistant to Robert Bunsen at University of Heidelberg and later professor of chemistry at the Clausthal Mining Academy and was an innovator in his field (chemical titration). Strengite is a relatively rare iron phosphate mineral with the formula:
Jasper National Park is truly amazing – beautiful rivers and valleys, several peaks over 3,000 meters, and an overall stunning geology. The western ridge forms the continental divide, separating streams that flow east and north to the Arctic Ocean or Hudson Bay from those which drain westward to the Pacific Ocean. Here, we see a tilted mountain composed of folded limestones.
Pyromorphite is as awesome as it sounds. The mineral is composed of lead chlorophosphate: Pb5(PO4)3Cl, sometimes occurring in sufficient abundance to be mined as an ore of lead. However, most of the time, it is found as a secondary mineral in the oxidized zones of lead ore deposits. The color of the mineral is usually some bright shade of green, yellow or
The Arctic tundra is one of the harshest environments on the face of the planet… but you wouldn’t tell that by looking at the photography of Ivan Kislov. In his pictures, the tundra is teeming with wildlife, represented in all its splendour.
I wanted to post something more science-oriented, or something more directly related to geology… but we have time for that. For now, let’s just admire the beauty of Mt Rainier in the sunset. Mount Rainier is a large stratovolcano located 54 miles (87 km) southeast of Seattle. It is the most topographically prominent mountain in the contiguous United States and