ID'OCRASE, noun [Gr. form, and mixture; a mixed figure.] A mineral, the vesuvian of Werner, sometimes massive, and very often in shining prismatic crystals. Its primitive form is a four-sided prism with square bases. It is found near Vesuvius, in unaltered rocks ejected by the volcano; also in primitive rocks, in various other localities.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI