Eisco Rock Gypsum Specimen (Sedimentary Rock), Approx. 3cm (1"), Pack of 12

12 rock gypsum specimens approximately 1" (3cm) in length Formed from the lithification of sulfate evaporite deposits Perfect size for use in classroom identification labs and exercises, corresponding well with Next Generation Science Standards evidence statements Useful for rock/mineral comparison studies, as well as lessons on sedimentary rock formation Specimens come in clear labeled bag for ideal storage Gypsum is a sulfate mineral formed as the byproduct of evaporating saltwater. When this mineral becomes lithified, it forms rock gypsum, a sedimentary rock. This pack of 12 samples is great for stocking a classroom, or as a part of a small rock collection or event.