Gneiss - Augen Specimen, ±1" in size, Each

Details

Gneiss is a high-grade metamorphic rock that forms when other rocks undergo alteration due to intense heat and pressure. The minerals in the rock become foliated, resulting in alternating light and dark bands. This rock sample is great for demonstrating metamorphic properties and can be used most effectively in lessons on the rock cycle and metamorphic rock identification.