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Shonkinite

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Name:
Its name, given by Weed and Pirsson in 1895, is derived from Shonkin, the Indian name for the Highwood Mountains of Montana.
A coarse-grained rock with abundant augite, some olivine, biotite or hornblende, and essential alkali feldspar and foids, usually nepheline. Now defined modally as a melanocratic variety of foid syenite in QAPF field 11. A dark-colored syenite composed chiefly of augite and alkali feldspar, and possibly containing olivine, hornblende, biotite, and nepheline.

Ref: AGI


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Classification of ShonkiniteHide

Foid-syenite is in section 11 of the QAPF diagram.

Mineralogy of ShonkiniteHide

Essential minerals - these are minerals that are required within the classification of this rock:
Feldspar > Alkali FeldsparFeldspar Group minerals rich in Potassium or Sodium.
FeldspathoidA family of rock-forming minerals consisting of aluminosilicates of sodium, potassium, or calcium and having too ...
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
Amphibole > HornblendeAn informal name for dark green to black amphiboles, mostly ferro-hornblende or ...
Feldspathoid > NephelineNa3K(Al4Si4O16)
Mica > BiotiteA series or subgroup of the Mica Group.
OlivineEquivalent to Fayalite-Forsterite Series; usually a more or less Fe-bearing forsterite.

Synonyms of ShonkiniteHide

References for ShonkiniteHide

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

Internet Links for ShonkiniteHide

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