Copper is one of the most famous and useful metals, and has been important since ancient civilizations for ornaments and coinage. Its complex crystals can be beautifully formed in odd and unique masterpieces that are treasured by collectors. Copper has been fashioned into ornamental objects and cooking utensils since the beginning of mankind. Copper is also used in pigments, insecticides, and fungicides, although it has of lately been largely replaced by synthetic chemicals.