Malawi Exports of granite, porphyry, basalt, sandstone, other monumental or building stone to Zambia was US$805 during 2011, according to the United Nations COMTRADE database on international trade. Malawi Exports of granite, porphyry, basalt, sandstone, other monumental or building stone to Zambia - data, historical chart and statistics - was last updated on May of 2024.