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An agpaitic rock is a peralkaline igneous … An agpaitic rock is a peralkaline igneous rock, typically nepheline syenite or phonolite. Characteristic minerals in these rocks include complex silicates containing zirconium, titanium, sodium, calcium, the rare-earth elements, and fluorine. Agpaites are unusually rich in rare and obscure minerals such as eudialyte, wöhlerite, loparite, astrophyllite, lorenzenite, catapleiite, lamprophyllite, and villiaumite (NaF). Sodalite is typically present, but not diagnostic.Less alkaline igneous rocks in which zircon, titanite, and ilmenite are characteristic are called . Agpaitic rocks were first described for an occurrence in the Ilimaussaq complex of southwest Greenland in 1911. Agpaitic rocks are present in the Lovozero and Khibiny Massif complexes of the Kola Peninsula, in Mont Saint-Hilaire, Quebec, Canada, in addition to the type locality of Ilimaussaq.dition to the type locality of Ilimaussaq.
, Una roccia agpaitica o agpaite è una rocci … Una roccia agpaitica o agpaite è una roccia magmatica , solitamente nefelinsienite o fonolite. È caratterizzata da rapporto molecolare (Na2O + K2O) / Al2O3 > 1 (in origine era > 1,2), alti contenuti di ferro, sodio, cloro e zirconio e bassi di magnesio e calcio. Il termine è attualmente (Sørensen, 1974) ristretto a nefelin sieniti peralcaline caratterizzate da complessi minerali di zirconio e titanio al posto dei normali zircone e ilmenite.o al posto dei normali zircone e ilmenite.
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| rdfs:comment |
An agpaitic rock is a peralkaline igneous … An agpaitic rock is a peralkaline igneous rock, typically nepheline syenite or phonolite. Characteristic minerals in these rocks include complex silicates containing zirconium, titanium, sodium, calcium, the rare-earth elements, and fluorine. Agpaites are unusually rich in rare and obscure minerals such as eudialyte, wöhlerite, loparite, astrophyllite, lorenzenite, catapleiite, lamprophyllite, and villiaumite (NaF). Sodalite is typically present, but not diagnostic.Less alkaline igneous rocks in which zircon, titanite, and ilmenite are characteristic are called .d ilmenite are characteristic are called .
, Una roccia agpaitica o agpaite è una rocci … Una roccia agpaitica o agpaite è una roccia magmatica , solitamente nefelinsienite o fonolite. È caratterizzata da rapporto molecolare (Na2O + K2O) / Al2O3 > 1 (in origine era > 1,2), alti contenuti di ferro, sodio, cloro e zirconio e bassi di magnesio e calcio. Il termine è attualmente (Sørensen, 1974) ristretto a nefelin sieniti peralcaline caratterizzate da complessi minerali di zirconio e titanio al posto dei normali zircone e ilmenite.o al posto dei normali zircone e ilmenite.
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| rdfs:label |
Roccia agpaitica
, Agpaitic rock
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