SO9391 : Calcite vein in limestone

taken 3 years ago, near to Dudley, Great Britain

Calcite vein in limestone
Calcite vein in limestone
Calcite is recrystallised calcium carbonate. While the limestone matrix is made up of ground fossil shells with some sand mixed in, the calcite in the vein is crystallised from solution. The specimen was found near the south end of Wren's Nest, where a fault line surfaces. The crack would have formed due to compressive stress near the fault. Subsequently, water has infiltrated the rock, dissolved some of the limestone and collected in the crack. Gradually, the solution has become supersaturated with calcium carbonate, and crystallisation has started from the surfaces adjoining the crack, gradually filling it up.
Geology of Wren's Nest, Dudley
See this Geograph article LinkExternal link about the geological history and limestone mining at Wren's Nest.
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SO9391, 75 images   (more nearby )
Photographer
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Date Taken
Sunday, 8 June, 2014   (more nearby)
Submitted
Monday, 25 August, 2014
Geographical Context
Geological interest  Rocks, Scree, Cliffs 
Primary Subject of Photo
Limestone Feature 
Subject Location
OSGB36: geotagged! SO 9373 9146 [10m precision]
WGS84: 52:31.2589N 2:5.6302W
Camera Location
OSGB36: geotagged! SO 9373 9144
View Direction
North-northwest (about 337 degrees)
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