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Lamprophyric-pyroxene-calcite-biotite olivine-melilitite

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A anusual and difficult rock to categorise; usually considered an intrusive, ultrapotassic rock, or an alkaline ultramafic igneous rock containing phlogopite-biotite, melilite, pyroxene, calcite and olivine.
Also considered to be a lamprophyre chiefly composed of biotite or phlogopite and melilite as essential minerals, commonly with olivine, calcite, and clinopyroxene. Perovskite, apatite, nepheline, and garnet may be present.

Also known as alnöite.

Ref: AGI

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Classification of Lamprophyric-pyroxene-calcite-biotite olivine-melilititeHide

Mineralogy of Lamprophyric-pyroxene-calcite-biotite olivine-melilititeHide

Essential minerals - these are minerals that are required within the classification of this rock:
Mica > BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg)([Si/Al]Si2O10)(OH/F)2
OlivineEquivalent to Fayalite-Forsterite Series; usually a more or less Fe-bearing forsterite.
PyroxeneA petrological term for Pyroxene Group.

Synonyms of Lamprophyric-pyroxene-calcite-biotite olivine-melilititeHide

References for Lamprophyric-pyroxene-calcite-biotite olivine-melilititeHide

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

Internet Links for Lamprophyric-pyroxene-calcite-biotite olivine-melilititeHide

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