Borolanite
A rock subtype
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A local name for a coarse-grained variety of nepheline-syenite consisting of alkali feldspar, nepheline (or its alteration products), melanite and biotite, and sometimes characterized by the presence of pseudoleucite.
Unique Identifiers
Mindat ID:
50568
Long-form identifier:
mindat:1:1:50568:0
GUID
(UUID V4):
(UUID V4):
4d6616d9-7dbb-4368-be59-f14b3052f417
Classification of Borolanite
Foid-syenite is in section 11 of the QAPF diagram.
Mineralogy of Borolanite
Essential minerals - these are minerals that are required within the classification of this rock:
Feldspar > Alkali Feldspar | A subgroup of the Feldspar Group, poor in calcium, and mostly rich in potassium. |
Feldspathoid > Nepheline | Na3K(Al4Si4O16) |
Melanite | Ca3(Fe3+,Ti)2(SiO4)3 |
Mica > Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 or Simplified: K(Mg,Fe)3AlSi3O10(OH)2 |
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
Pseudoleucite | Pseudomorph after leucite. |
Common Associates
Associated Minerals Based on Photo Data:
References for Borolanite
Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Le Maitre (ed.) (2002) Igneous Rocks - A Classification and Glossary of Terms. Cambridge Press
Internet Links for Borolanite
mindat.org URL:
https://www.mindat.org/min-50568.html
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