Prefix
|
Main name
|
Suffix
|
1st: % of phenocrysts
|
2nd: relative abundance of phenocrysts
|
If phyric:
|
|
Aphyric (<1%)
|
Sorted by increasing abundance from left to right, separated by hyphens
|
Basalt: black to dark gray, typically olivine-bearing volcanic rock
|
Massive lava: massive core, brecciated or vesiculated flow top and bottom, >1 m thick
|
Sparsely phyric (1%−5%)
|
|
Andesite: dark to light gray, contains pyroxenes and/or feldspar and/or amphibole and is typically devoid of olivine and quartz
|
Pillow lava: subrounded bodies separated by glassy margins and/or hyaloclastite with radiating fractures 0.2 to 1 m wide
|
Moderately phyric (5%−20%)
|
|
Rhyolite-dacite: light gray to pale white, and/or quartz and/or biotite-bearing volcanic rock
|
Intrusive sheet: dyke or sill, massive core with unvesiculated chilled margin, from millimeters to several meters thick
|
Highly phyric (>20%)
|
|
|
Lithic clast, pumice clast, scoria clast: volcanic or plutonic lapilli or blocks >2 cm, to be defined as sample domain
|
|
|
If aphyric:
|
Hyaloclastite: breccia made of glassy fragments
|
|
|
Basalt: dark colored
|
Breccia
|
|
|
Rhyolite: light colored
|
|