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Barytes (or barite) is a colourless or white naturally occurring mineral form of barium sulphate occurring in sedimentary rocks and with sulphide ores. Its main properties are its high specific gravity (4.5), very low solubility; it is non-toxic, and also chemically and physically unreactive.
The International Maritime Solid Bulk Cargoes (IMSBC) Code classifies barytes as Group C which applies to cargoes which are not liable to liquefy and do not possess chemical hazards.
However, cargoes from China may have a moisture content which would make it Group A.

Download West of England P&I Club Safety Alert (December 2011)