limonite
3.Glauconite, hematite-limonite and some chlorite are formed in syndiagenesis.
4.Evidence of emergence including sabkha dolostone, algal mat, bird-eyes and fenestral structure, mudcracks and crustose limonite has been found in the top of the Changhsingian reefs in Ziyun, Guizhou province.
5.The Banhua stone as a decoeration pigment is a kind of limonite which could be transferred to hematite α-Fe_2O_3 and magnetite in the heating process, so the porcelain surface was covered with black or brown design deeoration.
6.Isotopic chronological study of mineralization show that the fluid inclusion Rb-Sr isochron age for gold-bearing pyrite-quartz veins and pyrite-limonite-quartz veins from the Dashankou gold mine are 354±8.1Ma (2σ ) and 344±21Ma (2σ ), respectively. The two ages are consistent in test errors, indicating the gold deposit was formed in early Carboniferous and related to regional shearing;
7.Huangmei has a rich reserve of underground minerals, 15 sorts are proven to have exploitation value, of which, limonite and siderite have a reserve of 58 million tons, the tenor is around 45%, being concentrated; quartz is of 100 million tons; gypsum mine is 270 million tons; barite is 500,000 tons and silex of 10 million tons; porcelain clay, limestone, shale and granite are extensively distributed and of large reserve.
