Huāgāngyán shì yī zhǒng fēicháng jiānyìng de yánshí.
Granite is an extremely hard type of rock.
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花 (flower/patterned) + 岗 (ridge/mound) + 岩 (rock) = 'patterned ridge rock'. Granite gets its name from its characteristic speckled, patterned appearance — like a flower-dotted hillside.