URI	prefLabel	Definition	Source
http://resource.geosciml.org/classifier/cgi/metamorphicgrade/high_metamorphic_grade	high metamorphic grade	"Protolith structures almost always obliterated, evidence of partial melting common. Includes rocks metamorphosed in high-temperature amphibolite, pyroxene hornfels, and medium to high-temperature eclogite facies. Mineral assemblages according to Fry (1984) Table 10-1: ultramafic-olivine, anthophyllite, cummingtonite, enstatite, mafic-hornblende, (diopside, garnet), calc-aluminous basic-plagioclase, pelite, semi-pelite -- K-feldspar, biotite, quartz, Al-minerals (garnet), migmatite."	"Smulikowski et al, 2003, Fry, 1984"
http://resource.geosciml.org/classifier/cgi/metamorphicgrade/low_metamorphic_grade	low metamorphic grade	"Metamorphic effects clearly visible, protolith structures typically still observable, includes rocks metamorphosed in greenschisthigh-temperature blueschist, very low temperature eclogite facies. Mineral assemblages according to Fry (1984) Table 10-1: ultramafic-serpentine (talc, magnesite), mafic-chlorite, actinolite (garnet), calc-aluminous basic-albite, epidote, pelite, semi-pelite -- white mica, chlorite, quartz, biotite (garnet, Al-minerals)."	"Smulikowski et al, 2003, Fry, 1984"
http://resource.geosciml.org/classifier/cgi/metamorphicgrade/medium_metamorphic_grade	medium metamorphic grade	"Protolith structure typically obliterated. Includes rocks metamorphosed in high-temperature epidote-amphibolite, low-temperature amphibolite, and low temperature eclogite facies. Mineral assemblages according to Fry (1984) Table 10-1: ultramafic-olivine, talc (magnesite, anthophyllite), mafic-hornblende, (diopside, garnet), calc-aluminous basic-plagioclase, pelite, semi-pelite -- white mica, biotite, quartz (garnet, Al-minerals)."	"Smulikowski et al, 2003, Fry, 1984"
http://resource.geosciml.org/classifier/cgi/metamorphicgrade/metamorphic_grade_not_specified	metamorphic grade not specified	for use in normative descriptions to explicitly indicate that any metamorphic condition is allowed (including non-metamorphosed).	This Vocabulary
http://resource.geosciml.org/classifier/cgi/metamorphicgrade/metamorphic_grade_unknown	metamorphic grade unknown	For use in instance descriptions to indicate that no information is available on metamorphic grade	This Vocabulary
http://resource.geosciml.org/classifier/cgi/metamorphicgrade/metamorphosed_grade_not_specified	metamorphosed grade not specified	"Rock is metamorphosed, may have any value for metamorphic grade."	This Vocabulary
http://resource.geosciml.org/classifier/cgi/metamorphicgrade/not_metamorphosed	not metamorphosed	Rock or sediment not metamorphosed.	This Vocabulary
http://resource.geosciml.org/classifier/cgi/metamorphicgrade/very_high_metamorphic_grade	very high metamorphic grade	"Protolith structures almost always obliterated. Includes rocks metamorphosed in granulite (or sanidinite), and high-temperature eclogite facies. Mineral assemblages according to Fry (1984) Table 10-1: ultramafic-olivine, enstatite, mafic-hypersthene, diopside (hornblende), calc-aluminous basic-plagioclase, pelite, semi-pelite -- hypersthene + Al-minerals (K-feldspar, quartz), or sapphirine."	"Smulikowski et al, 2003, Fry, 1984"
http://resource.geosciml.org/classifier/cgi/metamorphicgrade/very_low_metamorphic_grade	very low metamorphic grade	"Rock very slightly metamorphosed, protolith structure ubiquitous, mineral assemblage of zeolite facies, subgreenschist facies, or low temperature part of blueschist facies. Mineral assemblages according to Fry (1984) Table 10-1: ultramafic-serpentine (quartz, magnesite), mafic-clay, chlorite, relict igneous minerals, calc-aluminous basic-zeolite, pumpellite, epidote, albite, pelite, semi-pelite -- clays, chlorite, sericite, quartz."	"Smulikowski et al, 2003, Fry, 1984"