Microscopic inclusions in mantle-derived pyrope crystals. The mineral is inferred to have co-precipitated with the pyrope host in the presence of a fluid or melt phase at 650-750 de g C and 20-25 kbar pressures.
Approved IMA 1996 (Dana # Added)
Garnet Ridge, an ultramafic diatreme on the Colorado Plateau in Arizona, USA. Link to MinDat.org Location Data.
Named for Ian S. E. Charmchael, Professor of Geology at the University of California, Berkeley, in recognition