Arkite
A rock subtype
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A local name for a leucocratic variety of nepheline fergusite consisting of leucite or pseudoleucite in a matrix of nepheline, melanite garnet, biotite, sodic pyroxene, amphibole and minor alkali feldspar.
Unique Identifiers
Mindat ID:
50597
Long-form identifier:
mindat:1:1:50597:2
GUID
(UUID V4):
(UUID V4):
9063d989-c336-411f-9c07-1fc65a4e2774
Classification of Arkite
Fergusite is in section 15 of the QAPF diagram.
Mineralogy of Arkite
Essential minerals - these are minerals that are required within the classification of this rock:
Alkali pyroxene | A petrological name for the sodium-rich pyroxenes aegirine and aegirine-augite. |
Amphibole | (Na, K, ◻)(Ca,Na)2(Mg,Fe,Al)5((Si,Al)8O22)(OH,F,Cl,O)2 |
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 |
Pseudoleucite | Pseudomorph after leucite. |
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
Feldspathoid > Leucite | K(AlSi2O6) |
References for Arkite
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 Arkite
mindat.org URL:
https://www.mindat.org/min-50597.html
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