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Ornöite

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A local name for a variety of diorite consisting essentially of sodic plagioclase with minor hornblende, microcline, biotite and quartz.


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Classification of OrnöiteHide

Diorite is in section 10 of the QAPF diagram.

Mineralogy of OrnöiteHide

Essential minerals - these are minerals that are required within the classification of this rock:
Amphibole > HornblendeAn informal name for dark green to black amphiboles, mostly ferro-hornblende or ...
Feldspar > Alkali Feldspar > MicroclineK(AlSi3O8)
Mica > BiotiteA series or subgroup of the Mica Group.
Silica > QuartzSiO2
Sodic plagioclaseA petrological term for plagioclase feldspars dominant in sodium.

References for OrnöiteHide

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Le Maitre (ed.) (2002) Igneous Rocks - A Classification and Glossary of Terms. Cambridge Press

Internet Links for OrnöiteHide

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