Keywords

Trachytoid



Keyword Definition

Fine grained igneous rock than contains less than 90 percent mafic minerals, less than 10 percent feldspathoid mineral and less than 20 percent quartz in the QAPF fraction and has a plagioclase to total feldspar ratio less than 0.65. Mafic minerals typically include amphibole or mica; typically porphyritic. Includes rocks defined modally in QAPF fields 6, 7 and 8 (with subdivisions) or chemically in TAS Field T as trachyte or latite.

LeMaitre et al. 2002

See Also: basaltic-trachyandesite, trachyte(TAS), benmoreite, hawaiite, mugearite, potassic-trachybasalt, shoshonite, trachyandesite, trachybasalt, trachydacite

Parents: Fine grained igneous rock (86)

Children: Alkali feldspar trachytic rock (9); Latitic rock (154); Trachytic rock (257)

[Description taken from GeoSciML SimpleLithology201012.rdf]



Hierarchical classification

Sample >> Lithosphere >> Rock >> Whole >> Rock >> Igneous >> Fine grained >> Trachytoid

Children

Alkali feldspar (trachytic rock) | Latitic | Trachytic


Category: Analysed material

The different kinds of sample material collected in the field have been classified hierarchically. Examples: “till”, “soil”, “vegetation”. Taken from the “Sample_Types_SHARED” database table.


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