NJ5866 : Sillimanite

taken 3 years ago, near to Portsoy, Aberdeenshire, Great Britain

The tiny pale-coloured laths are a mineral called sillimanite. This is of great interest to geologists because it is one of a trio of polymorphs of aluminium silicate. What this means is that they take on different forms depending on the temperature and pressure to which they were subjected during metamorphism. This in turn reveals how deep down in the crust the rocks were when the minerals formed. The pencil serves as both a pointer and a scale.
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NJ5866, 146 images   (more nearby )
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Date Taken
Saturday, 13 September, 2014   (more nearby)
Sunday, 21 September, 2014
Geographical Context
Geological interest 
Subject Location
OSGB36: geotagged! NJ 5848 6650 [10m precision]
WGS84: 57:41.1848N 2:41.8801W
Camera Location
OSGB36: geotagged! NJ 5848 6650
View Direction
EAST (about 90 degrees)
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Image classification(about): Supplemental image
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