Malignite
A rock subtype
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A mesocratic nepheline-syenite containing abundant aegirine-augite and some orthoclase and nepheline in equal amounts. Many other mafic minerals, such as amphibole, garnet, biotite, may be present.
Now defined modally as a mesocratic variety of foid syenite.
Now defined modally as a mesocratic variety of foid syenite.
Unique Identifiers
Mindat ID:
50567
Long-form identifier:
mindat:1:1:50567:1
GUID
(UUID V4):
(UUID V4):
72dcb5e4-fffa-48b0-a7c0-3dbc42eca6dc
Classification of Malignite
Foid-syenite is in section 11 of the QAPF diagram.
Mineralogy of Malignite
Essential minerals - these are minerals that are required within the classification of this rock:
| Feldspar > Alkali Feldspar > Orthoclase | K(AlSi3O8) |
| Feldspathoid > Nepheline | Na3K(Al4Si4O16) |
| Pyroxene > Clinopyroxene > Aegirine-augite | (NaaCabFe2+cMgd)(Fe3+eAlfFe2+gMgh)Si2O6 |
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
| Amphibole | (Na, K, â—»)(Ca,Na)2(Mg,Fe,Al)5((Si,Al)8O22)(OH,F,Cl,O)2 |
| Garnet Group | X3Z2(SiO4)3 |
| Mica > Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
Internet Links for Malignite
mindat.org URL:
https://www.mindat.org/min-50567.html
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Please feel free to link to this page.
