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Borengite

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An aphanitic ultrapotassic dyke-rock with the highest recorded K2O concentrations (more than 14 wt.%) among alkalic rocks.


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Classification of BorengiteHide

Mineralogy of BorengiteHide

Essential minerals - these are minerals that are required within the classification of this rock:
Feldspar > Alkali Feldspar > OrthoclaseK(AlSi3O8)
FluoriteCaF2
SericiteKAl2(AlSi3O10)(OH)2
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
Apatite"Apatite" is a field term for unidentified calcium phosphate members of the apatite group.
PyriteFeS2

References for BorengiteHide

Reference List:
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Eckermann, H. von (1960): Borengite; a new ultra-potassic rock from Alnoe island. Arkiv foer Mineralogi och Geologi, 36, 519-528.
Le Bas, M.J. (1981): Carbonatite magmas. Mineralogical Magazine, 44, 133-140.
Mitchell, R. H. & Bergman, S.C. (1991): Petrology of lamproites. Plenum Press, New York, 447 pp.
Foley, S.F., Venturelli, G., Green, D.H. & Toscani, L. (1987): The ultrapotassic rocks: Characteristics, classification, and constraints for petrogenetic models. Earth Sci. Rev., 24, 81-134.
Le Maitre (ed.) (2002) Igneous Rocks - A Classification and Glossary of Terms. Cambridge Press.

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