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perthite

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perthite [′pər‚thīt]
(geology)
A parallel to subparallel intergrowth of potassium and sodium feldspar; the potassium-rich phase is usually the host from which the sodium-rich phase evolves.
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The type locality for perthite, for instance, now lies buried beneath a highway in Ontario.
Geoheritage 2. Examples of geoeducation, geoconservation and ... by Donaldson, J. Allan / Geoscience Canada
Late recrystallization of magmatic sanidine resulting in perthite formation supposedly did not take place because the rocks have not been heated more than 50-100[degrees]C during the geological history, as indicated by the alteration index of conodonts, which varies between 1 and 2 in the Silurian and Ordovician rocks of Estonia (Mannik & Viira 1990).
Correlation of Telychian sections from shallow to deep sea facies in ... by Kiipli, Tarmo; Kallaste, Toivo / Proceedings of the Estonian Academy of Sciences: Geology
Exiled Perthite Brian Thomson from Kettering said: "Tam Cowan's comments about the size of St Johnstone's crowds were out of order.
FOOTBALL: SPORTS HOTLINE; Seeing red over the boys in blue by Calls, Ewing Grahame Takes Your / Daily Record (Glasgow, Scotland)
 
 
 
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