Earth material that is composed of one or more single rock types
Amphibolite, hornblende-schist and metagabbro

http://data.bgs.ac.uk/id/EarthMaterialClass/RockComposite/AHMG
Statushttp://data.bgs.ac.uk/ref/CurrentStatus/CURRENT
Has parthttp://data.bgs.ac.uk/id/EarthMaterialClass/RockName/AMPHB
http://data.bgs.ac.uk/id/EarthMaterialClass/RockName/HBSCH
Schemahttp://data.bgs.ac.uk/ref/EarthMaterialClass/RockComposite
Label"Amphibolite, hornblende-schist and metagabbro" language=en 
See alsohttp://dbpedia.org/resource/Gabbro
http://dbpedia.org/resource/Schist
http://dbpedia.org/resource/Hornblende
http://dbpedia.org/resource/Amphibolite
Typehttp://www.w3.org/2004/02/skos/core#Concept
Definition"AMPHIBOLITE, HORNBLENDE-SCHIST AND METAGABBRO" language=en 
Is in schemehttp://data.bgs.ac.uk/ref/EarthMaterialClass/RockComposite
Preferred label"Amphibolite, hornblende-schist and metagabbro" language=en 

namespaces used
bgsienBGS RCS Named Rock
bgsiepBGS RCS Rock Component
bgsrBGS Schemas
bgsrcBGS Current Status Codes
bgsreBGS RCS Earth Material Classes
bgsrgBGS Geochronology
bgsrlBGS Lexicon of Named Rock Units
bgsrmBGS 1:625 000 Digital Geological Map
dctDublin Core terms
rdfResource Description Framework
rdfsResource Description Framework - Schema
skosSimple Knowledge Organization System
xsdXML Schema Data Type