Stone rotary quern for grinding black tea (or known as red tea, 'hong cha' in Chinese). It consists of two coarse stone discs with grooved radiating lines on the grinding surfaces, kept in position by a central wooden axle. The upper disc is mobile and moved in a rotary motion over the lower static disc through revolving a wooden handle by hand, which is now missing. A large hole on the upper disc is for filling in the tea leaves.
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