Devitrification of Obsidian
Joel Gill
King's College London/Geology for Global Development, London, United Kingdom
A photomicroscope image of devitrifying obsidian, showing a clear nucleus for spherulite growth and their radial growth from this nucleus. Photo taken from a sample of obsidian collected in Northern Chile (2007). In reflecting on the theme 'active planet', this image demonstrates activity at both a large scale (i.e., initial eruption of magma and formation of obsidian) and a small scale (i.e., devitrification of the obsidian).
Reuse
Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported (CC BY-NC-SA 3.0) (opens in a new window)Credit: Joel Gill (distributed via imaggeo.egu.eu)
Properties
Type
Image
Format
JPG
Size
2.8 MB
Width
3648 px
Height
2736 px
Aspect
4:3
Brand
Canon
Model
PowerShot A640
Exposure
29 mm f/7.1 1/25 s ISO 74
Taken
28 November 2007
Coordinates
-23.6659, -69.3388
Tint
Black
Submitted
8 February 2016
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