Definition of granulite in US English:

granulite

noun

Geology
  • A fine-grained granular metamorphic rock in which the main component minerals are typically feldspars and quartz.

    • ‘These rocks display clear prograde metamorphism that peaks in granulite facies.’
    • ‘Two types of terrain are especially characteristic of Archaean geology: greenstone - granite terrains and granulite - gneiss terrains.’
    • ‘This granulite consists of garnet, biotite, muscovite, quartz, plagioclase and cordierite.’
    • ‘This indicates that the sapphirine granulite could be a different variety of pelitic granulites.’
    • ‘The granulite to eclogite transformation may not occur if water is absent; for example, if ocean crust has been dehydrated as happens when a slab subducts.’

Origin

Mid 19th century: from granule + -ite.

Pronunciation

granulite

/ˈɡrænjəˌlaɪt//ˈɡranyəˌlīt/