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It would be instructive for students to compare these two dune sands - both fine-grained but very different in color
or one of those plus some number of coins
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
concentrated into a huge dune field in present day southern Utah
The brown color is unusual and is derived from iron in the limestone that was released by the metamorphism
gypsum - sand selenite rose from a dry lake near Oujda, Morocco - large hand/display specimen It would be instructive forSelenite 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.
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