Gangue minerals include calcite, barite, and dolomite. Gangue minerals are calcite, gypsum, pyrite, iron oxide, and barite. It is commonly associated with fluorite, celestine, galena, barite, calcite, and aragonite. Crystals of calcite, quartz, dolomite or barite may line small cavities in the rock. There are also deposits of Fluorite, Barite, Witherite, Calcite, Dolomite and Barytocalcite. In such vein deposits is can be associated with galena, sphalerite, barite, quartz, and calcite. It occurs in hydrothermal deposits associated with sphalerite, pyrite, chalcopyrite, barite and marcasite. Important mineral resources include manganese, gold, ferberite, coal, barite, bentonite, uranium, and vanadium. It occurs in association with orpiment, arsenolite, calcite and barite. Resources available for mining include coal, gypsum, iron ore, gold, salt and barite. Other associated minerals include wulfenite, limonite, and barite. The Ozarks contain ore deposits of lead, zinc, iron and barite. Apatite, barite and vermiculite are among the industrially important minerals associated with some carbonatites. India ranks second amongst the world's largest producers of barite and chromite. Gansu has advantages in getting nickel, zinc, cobalt, platinum, iridium, copper, barite, and baudisserite.