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Lamprophyre

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About LamprophyreHide

A group of hypabyssal igneous rocks characterised by abundant primary hydrous silicates in phenocrysts and/ or groundmass, lacking felsic phenocrysts, usually occurring in dykes.

A group of dark-colored, porphyritic, hypabyssal igneous rocks characterized by panidiomorphic texture, a high percentage of mafic minerals (esp. biotite, hornblende, and pyroxene), which form the phenocrysts, and a fine-grained groundmass with the same mafic minerals in addition to feldspars and/or feldspathoids; also, any rock in that group. Most lamprophyres are highly altered. They are commonly associated with carbonatites.


Classification of LamprophyreHide

Sub-divisions of LamprophyreHide

Mineralogy of LamprophyreHide

Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
AmphiboleAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2
Feldspar > Alkali Feldspar > K FeldsparPotassium-dominant feldspars with unknown crystal symmetry and Al-Si ordering state.
Feldspar > PlagioclaseA petrological term for Albite-Anorthite Series.
FeldspathoidA family of rock-forming minerals consisting of aluminosilicates of sodium, potassium, or calcium and having too ...
MicaA petrological term for Mica Group.

References for LamprophyreHide

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

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