Ri*pid"o*lite (?), n. [Gr. . . fan + -lite.] Min.
A translucent mineral of a green color and micaceous structure, belonging to the chlorite group; a hydrous silicate of alumina, magnesia, and iron; -- called also clinochlore.
<-- sic. note use of "alumina", not "aluminia". Spelling must have been changing about 1890 -->
© Webster 1913.