Cordierite (cordierite group)
Dimensions:0.1 cm - 0.2 cm
Object number: 2020.6.172
DescriptionSix samples in vial, label states "from biotite-cordierite-garnet-magnetite-plagioclase-quartz-sillimanite gneiss"
Reference: F. Barker, 1962, American Mineralogist 47, p. 911.