Granite
The intrusion of the granite into the surrounding sedimentary rocks gave rise to extensive metamorphism and mineralisation, and this led to Cornwall being one of the most important mining areas in Europe until the early 20th century. It is thought that tin ore (cassiterite) was exploited in Cornwall as early as the Bronze Age. Over the years, many other metals such as copper, lead, zinc and silver have all been mined in Cornwall. Alteration of the granite also gave rise to extensive deposits of china clay (kaolinite), especially in the area to the north of St Austell, and this remains one of Cornwall's most important industries.
Read more about this topic: Geology Of Cornwall
Famous quotes containing the word granite:
“Man’s own youth is the world’s youth; at least he feels as if it were, and imagines that the earth’s granite substance is something not yet hardened, and which he can mould into whatever shape he likes.”
—Nathaniel Hawthorne (1804–1864)
“I make myself this time
Of wood or granite or lime
A wall too hard for crime
Either to breach or climb....”
—Robert Frost (1874–1963)
“We placed the wreaths upon the splended granite sarcophagus, and at its feet, and felt that only the earthly robe we loved so much was there. The pure, tender, loving spirit which loved us so tenderly, is above us—loving us, praying for us, and free from all suffering and woe—yes, that is a comfort, and that first birthday in another world must have been a far brighter one than any in this poor world below!”
—Victoria (1819–1901)