Dahuigou wollastonitite of Jilin province occurs in strata of argillaceous banded marble intercalated with siliceous banded marble, with the direct host being marble. Stratoid in form, it consists mainly of wollastonite (over 95%)，together with small amounts of diopside, garnet and calcite. Geological, petrological, mineralogical and geochemical studies of wollastonitite combined with experimental researches conducted by previous workers indicate that wollastonitite of this area is a kind of metasomatite formed by regional metamorphic hydrothermal process, and the wollastonite within it belongs in low-temperature triclinowollastonite (a-CaSiO3).