Formula: Mg3Al2(SiO4)3 Isometric
Description: Pyrope is a magnesium-rich member of the garnet group found in rocks such as lamproites, anorthosite, serpentinite and their metamorphosed equivalents. It may survive weathering as a heavy detrital mineral. The chromium-rich member is considered an indicator mineral for diamond deposits.
KENOSHA COUNTY: Chrome pyrope occurs as in a subsurface, diamond-bearing lamprophyre diatreme, discovered within the outskirts of Kenosha (Carlson and Adams, 1997).