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A dark plagioclase-rich akerite. From Lortlauptal, W. Vikersund, Oslo district, Norway.
Classification of Essexite-akeriteHide
Mineralogy of Essexite-akeriteHide
Essential minerals - these are minerals that are required within the classification of this rock:
|Feldspar > Alkali Feldspar||Feldspar Group minerals rich in Potassium or Sodium.|
|Feldspar > Plagioclase||A petrological term for Albite-Anorthite Series.|
|Mica > Biotite||A series or subgroup of the Mica Group.|
|Pyroxene||A petrological term for Pyroxene Group.|
Non-essential minerals - these minerals are common, sometimes major components, but are not always present: