Listwanite /ˈlɪstwənaɪt/ – is a medium- and low-temperature metasomatic rock formed by changing ultrabasic, less often basic and carbonate rocks under the influence of solutions enriched with CO2. They consist of quartz, carbonate (ankerite, breinerite), chrome mica (fuchsite) and pyrite; tourmaline, rutile, sphene, actinolite, chlorite, talc, serpentine and chromite are also found (the last three minerals are clearly relict from serpentinites subjected to larch).
Ex. Listwanite forms when ultramafic rocks (most commonly mantle peridotites) are completely carbonated.