py·rophyl·lite \ˌpīrōˈfiˌlīt, pīˈräfəˌl-\noun (-s) Etymology: German pyrophyllit, from pyr- + phyll- + -it -ite : a mineral AlSi2O5(OH) that is a usually white or greenish hydrous aluminum silicate, resembles talc, and occurs in a foliated form or in compact masses — compare agalmatolite