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Angolaite

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A peralkaline syenite consisting of alkali feldspar (87% in type material), titanaugite with aegirine-augite rims (5%), aegirine (0.7%), fayalite (3.6%) and accessory magnetite, apatite, aenigmatite, hastingsite and cancrinite.


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Classification of AngolaiteHide

Mineralogy of AngolaiteHide

Essential minerals - these are minerals that are required within the classification of this rock:
Feldspar > Alkali FeldsparFeldspar Group minerals rich in Potassium or Sodium.
Olivine > FayaliteFe2+2SiO4
Pyroxene > Clinopyroxene > AegirineNaFe3+Si2O6
Pyroxene > Clinopyroxene > Aegirine-augite(NaaCabFe2+cMgd)(Fe3+eAlfFe2+gMgh)Si2O6
Titanian Augite(Ca,Na)(Mg,Ti, Fe,Al,)(Si,Al)2O6
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
AenigmatiteNa2Fe2+5Ti(Si6O18)O2
Apatite"Apatite" is a field term for unidentified calcium phosphate members of the apatite group.
Feldspathoid > Cancrinite(Na,Ca,☐)8(Al6Si6O24)(CO3,SO4)2 · 2H2O
Hastingsite{Na}{Ca2}{Fe2+4Fe3+}(Al2Si6O22)(OH)2
MagnetiteFe2+Fe3+2O4

References for AngolaiteHide

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

Internet Links for AngolaiteHide

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