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Peat is found in abundance, as well as gypsum, china-clay, potters' earth and salt.
The exports are ice, timber (including telegraph poles for the British government), wood-pulp and copper, and the imports coal and china-clay.
A few of the most important clay rocks, such as china-clay, brick-clay, red-clay and shale, may be briefly described here.
China-clay is white, friable and earthy.
Yellow and pinkish varieties of china-clay and pipe-clay contain a small quantity of oxide of iron.