One of the mysteries of the English language finally explained.
A coarse-grained plutonic rock containing quartz and plagioclase, between granite and diorite in composition.
- ‘They were composed of solid granodiorite; a very hard igneous rock.’
- ‘It grades inwards over tens to hundreds of metres into a coarser-grained porphyritic granodiorite.’
- ‘The contact is vertical, with granodiorite the dominant rock below a depth of about 100 feet.’
- ‘Granite and granodiorite are examples of silica-rich plutonic rocks.’
- ‘These stone balls are formed when the material - granodiorite, a metamorphic rock - melts in magma and is of different density than the surrounding fluid.’
Late 19th century: from granite + diorite.
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