2014

NM4989 : Cliffs and Scree north of Struidh

taken 10 years ago, near to Cleadale, Eigg, Scotland

Cliffs and Scree north of Struidh
Cliffs and Scree north of Struidh
The cliff line on the east side of the lava plateau of Beinn Bhuidhe continues its typical form north of Struidh, with screes obscuring the base of the cliffs, and the debris from ancient landslips below that. The prominent pale band is a mugearite lava flow.
Mugearite :: NM4988

Mugearite is a type of andesite, which occurs when magma of a specific chemical composition is erupted on the surface of the Earth. The chemical composition of the rock results in different lichens colonising the surface, making mugearite look distinctly paler than the basalt flows above and below.

Mugearite is named after Mugeary in Skye, where it was first described. See Link.

In technical terms, mugearite is defined chemically as the sodic variety of basaltic trachyandesite. What that means in plain English is that it contains more silica than an 'average' basalt and more sodic feldspar and less alkali feldspar than an 'average' andesite. But, as with everything in geology, it's actually far more complicated than the plain English suggests.


Creative Commons Licence [Some Rights Reserved]   © Copyright Anne Burgess and licensed for reuse under this Creative Commons Licence.
This photo is linked from: Automatic Clusters: · Ancient [2] · Landslips [2] ·
1:50,000 Modern Day Landranger(TM) Map © Crown Copyright
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1:50,000 Modern Day Landranger(TM) Map © Crown Copyright
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NM4989, 8 images   (more nearby 🔍)
Photographer
Anne Burgess   (more nearby)
Date Taken
Wednesday, 30 April, 2014   (more nearby)
Submitted
Thursday, 5 June, 2014
Subject Location
OSGB36: geotagged! NM 4943 8924 [10m precision]
WGS84: 56:55.5865N 6:7.1744W
Camera Location
OSGB36: geotagged! NM 4967 8910
View Direction
West-northwest (about 292 degrees)
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Image classification(about): Geograph (Second Visitor for NM4989) · First in 5 Years (TPoint) (about)
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