gypsum - sand selenite rose from a dry lake near Oujda, Morocco - large hand/display specimen Chalcopyrite is the primary sulfide

Chalcopyrite is the primary sulfide ore of copper

These specialized  crucibles are used in determining the mass of precipitates

These attractive clusters are washed

concentrated into a huge dune field in present day southern Utah

This particular volcanic igneous rock is composed of volcanic ash and many fragments (clasts) of other igneous rocks that were ejected from a volcanic vent

gypsum - sand selenite rose from a dry lake near Oujda, Morocco - large hand/display specimen Chalcopyrite is the primary sulfideSelenite gypsum sand rose CaSO4 2H2O Selenite gypsum sand roses form in seasonal desert lakes as they dry. Selenite is typically transparent, but when it crystallizes in sandy conditions it forms rosettes of flattened crystals, the rose petals, which are either encrusted with sand or with sand embedded throughout. The color of the gypsum crystals depends on the color of the sand in that dry lake. These Moroccan examples are particularly attractive.