Anorthositoid
A rock classification type
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About Anorthositoid
Name:
For its constitution, anorthite-rich.
A coarse-grained crystalline normal igneous rock composed mostly of plagioclase. Anorthosite is usually an intrusive rock characterized by its composition: mostly calcian plagioclase feldspar (90–100%), with a small mafic component (0–10%). Pyroxene, ilmenite, magnetite and olivine are commonly present.
Unique Identifiers
Mindat ID:
50547
Long-form identifier:
mindat:1:1:50547:7
GUID
(UUID V4):
(UUID V4):
99ef51b8-331b-4b12-a082-ae60e1267d2c
Classification of Anorthositoid
Anorthositic rocks are in sections 10,10* and 10' of the QAPF diagram.
Sub-divisions of Anorthositoid
Mineralogy of Anorthositoid
Essential minerals - these are minerals that are required within the classification of this rock:
| Feldspar > Plagioclase > Anorthite | Ca(Al2Si2O8) |
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
| Amphibole > Hornblende | A commonly used informal name for dark green to black amphiboles, largely in the Hornblende Root Name ... |
| Mica > Biotite | K(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2 |
| Olivine Group | M2SiO4 |
| Pyroxene | A petrological term for Pyroxene Group. |
Synonyms of Anorthositoid
Internet Links for Anorthositoid
mindat.org URL:
https://www.mindat.org/min-50547.html
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References for Anorthositoid
Reference List:
Ashland Black Granite Quarry, Ashland County, Wisconsin, USA