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RECOMMENDED ONLINE RESOURCES

  

How to recognise fake fossils:

http://www.fossilmuseum.net/

collect/fossilfakes.htm​​​​​​​

  

If you've found a meteorite:

https://sites.wustl.edu/

meteoritesite/items/what_to_do/

​​​​​​​

If you live in London:

​​​​​​​​​​​​http://londonpavement

geology.co.uk​​​​​​​
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For beautiful decorative stones:

​​​​​​​http://www.oum.ox.ac.uk/corsi/​​​​​​​

  

For the geology of where you are:

https://www.bgs.ac.uk/discovering

Geology/geologyOfBritain/viewer.html​​​​​​​
​​​​​​​​​​​​​​​​​​​  
​​​​​​​​​​​​​​​​​​​​​
The Jurassic Coast fossil finder:

https://jurassiccoast.org/what-is-the-

jurassic-coast/all-about-fossils/fossil-

finder/fossil-finder-database/

  

The rocks and minerals of Minecraft​​​​​​​​​​​​​​

https://www.mindat.org/a/minecraft​​​​​​​

    

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MAHOGANY OBSIDIAN - Oregon, USA

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Home > MINERALS > UNUSUAL ROCKS AND MINERALS - WEIRD AND WONDERFUL !

 
MAHOGANY OBSIDIAN

Oregon, USA

Obsidian is a natural volcanic glass, formed when lava from a volcano cools extremely quickly leaving no time for crystals to grow.  Amazingly, it is the same chemical composition as granite but granite has cooled very slowly deep underground forming large crystals. 

The lava that produces obsidian is usually sticky and highly viscous, resulting in explosively violent volcanic eruptions. 

The brown and red varieties of obsidian are called 'mahogany obsidian', the colour due to oxidation of iron in the original magma. 

Caution: Just like man-made glass, broken pieces of obsidian often have very sharp edges.

Click on a picture for a larger image


Size:  7 x 6.5 x 1.5 centimetres
Weight:  82 grams

PRICE: £12.00