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is the most common sulfide mineral
Its hardness is 4 on the Mohs Scale of Mineral Hardness
The quarry is inactive
and various shades of yellow
gypsum - unusual sand selenite from a dry lake near Ica, Ica Province, southern Peru - hand specimen is the most common 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 Peruvian examples were recently discovered and
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