M25. Dunite - Ekremsetter Quarry, Norway
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Fact sheet
Description: 

This dunite is from the so-called Western Gneiss Region of Norway, and has been quarried for use as a refractory sand for high-temperature castings since V.M. Goldschmidt recognized its potential for such purposes.  It contains Mg-orthopyroxene (enstatite) and Mg-Al chlorite as well as the dominant olivine, and all minerals share a grain-shape alignment having last equilibrated together under directed stress, presumably during the Scandian (ca 400 Ma) orogeny that affected rocks in western Norway when Baltica collided with Laurentia. The protolith may have been a slab of oceanic crust and mantle (ophiolite).

In Place
In Time
Location description: 
Almklovolal, Norway
Accuracy:
Timescale:
Not known
Ma = Millions of years ago
In Focus
Type:
Type: 
igneous
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Rock-forming minerals:

Rock forming mineral:

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