ASTRID & HANNS-FRIEDER MICHLER / SCIENCE PHOTO LIBRARY ASTRID & HANNS-FRIEDER MICHLER / SCIENCE PHOTO LIBRARY
Porcelain pestle and mortar. Porcelain is a type of ceramic material (a non-metallic mineral created from powder and sintered at high temperatures) characterised by its hardness, translucence and shining finish. First developed in China, it is made of kaolin and petuntse, a fusible feldspar consisting chiefly of quartz which has been reduced to a fine, white powder.
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