A large specimen consisting almost wholly of very coarse-grained, medium-brown diopside and white calcite, but including scattered grains of franklinite (most 0.5 cm or less across) and small masses of pale tan hardystonite, plus willemite (fl. green SW) and clinohedrite (fl. orange SW) as minor hydrothermal alteration products. The main diopside grain is 8 cm across and displays prominent basal partings that cause it to break into thin plates. Franklin Mineral Museum specimen FMM-607, ex Ewald Gerstmann collection.
Identifier: DPS4a Locality: Franklin mine, Franklin Specimen size: 26 x 18 x 12 cm Photo credit: Earl R. Verbeek
