Later weathering exposed a variety of minerals such as kaolin, alunite, and jarosite. Small deposits of alunite and jarosite were also discovered. It is the first volcano known to vent alunite minerals. Most of the alunite mining activity ended after the war. Some alums occur as minerals, the most important being alunite. In one of the jars, a mixture of alunite and potassium nitrate was found. Associated minerals include bismutite, mica, jarosite, alunite, cerussite, atacamite, connellite. The production of potassium alum from alunite is archaeologically attested on the island Lesbos. Deposits of cinnabar, alunite, hematite, hyalite, and pyrite are also found in certain areas. The alunite supergroup includes the alunite, jarosite, beudantite, crandallite and florencite subgroups. Potassium alum historically was mainly extracted from alunite. The alunite supergroup has the general formula AB(TO)(OH). Other minerals found on Mars were jarosite, alunite, hematite, opal, and gypsum. Alunite is abundant and Wenzhou claims to be the "Alunite Capital of the World". In some occurrences alunite, potassium aluminium sulfate, is a prominent secondary mineral.