GeoPicture of the week: Cumulonimbus Cloud over Africa

This stunning picture by NASA shows a Cumulonimbus above Africa, and an accurate description of the cloud and how it forms.

GeoPicture of the week: The Mexican hat

When you look at these rocks – it’s quite easy to understand why they’re usually called ‘The Mexican hat’: The Mexican hat is a rock formation in south-central San Juan County, Utah, United States. Interestingly, it’s the name of a mini-village (named after the formation), with 31 people inhabiting it. The formation is a 60-foot […]

GeoPicture of the Week: What Causes the Colour of Gemstones

You may have wondered exactly what is it that makes gemstones so brightly colored, and if you were curious enough to actually pursue that question, you found out that it’s all chemistry. This picture explains it: Most minerals are actually colorless in their pure form, and they are colored by impurities. The color itself is […]

GeoPicture of the Week: The Lion Rock in Sri Lanka

The Sri Lankan lion rock (Sigiriya) is an ancient palace of archaeological and geological importance. The site is dominated by a massive column of rock nearly 200 metres (660 ft) high. According to the ancient Sri Lankan chronicle the Culavangsha, this site was selected by King Kasyapa (477 – 495 CE) for his new capital. He built […]

GeoPicture of the Week: Geologic Faults

This picture from Cornell University really encapsulates the beauty of a geologic fault – it’s like someone took it from a text book and slammed into real life. In geology, a fault is a planar fracture or discontinuity in a volume of rock, across which there has been significant displacement along the fractures. You can see […]

GeoPicture of the Week: Mount Fuji, as seen from the ISS

This week, we’re trying something different from rocks or mountain formations – we’re looking at an entire mountain – Mount Fuji – as seen from the International Space Station. The view is spectacular. Image credits Wikimedia.  

GeoPicture of the Week: Perfect Pyrite cube

  Quite an awesome picture of a single pyrite crystal, isn’t it? I always find it fun that when they see something like this, most people don’t think it’s natural, that it’s somehow man made or at the very least cut by man – but that’s not really how it works. Pyrite usually forms cuboid crystals, […]

GeoPicture of the week: Uvarovite, an uncommon type of garnet.

Garnets are a diverse group of minerals, most of which vary in color from brown to black-ish. Uvarovite however is a deep green, really lovely to look at. The different species are pyrope, almandine, spessartine, grossular (varieties of which are hessonite or cinnamon-stone and tsavorite), uvarovite and andradite. Here are some remarkable pictures of other garnets: […]

GeoPicture of the week: Mind blowing Bismuth

This is Bismuth – it is a natural chemical element which chemically resembles arsenic and antimony. Elemental bismuth may occur naturally, but this form does not occur naturally – it was developed in a lab. Still, it’s just mind boggling how beautiful it is!

GeoPicture of the Week (2): Volcanic eruption seen from the space shuttle

In this incredible capture taken on 30 September 1994, we see a major eruption of Klyuchevskaya Sopka as seen by the astronauts aboard the Space Shuttle Endeavour. It is yet another testament of the immense power that volcanoes have, as the ash rose 60.000 feet into the air (almost 19.000 meters) and spread as far as 640 miles […]

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