Congo Exports of clays, andalusite, kyanite, sillimanite, mullite, chamotte, dinas earths to Zambia was US$13 during 2019, according to the United Nations COMTRADE database on international trade. Congo Exports of clays, andalusite, kyanite, sillimanite, mullite, chamotte, dinas earths to Zambia - data, historical chart and statistics - was last updated on April of 2026.