Sulfates: Glauberite
Diagnostic card.
Glauberite from Campo Verde, Arizona (United States)
Ca Na 2 (SO 4 ) 2
Singonia monoclinic
Hardness 2,5-3
Specific weight 2,8
Cleavage is perfect
Fracture brittle, brittle
Colorless, yellow, gray
Color in powder white
Glitter glass
Crystallizes in the monoclinic system. It is represented by crystals of different shapes: pyramidal, prismatic; Cleavage is perfect. The color may be absent, sometimes it varies to light yellow, gray, brick red.
Diagnostic signs.
In moist air, the glauberite is covered with a touch of weathering products. It becomes opaque in water and decomposes to form an insoluble gypsum.
Origin.
It is a common mineral of evaporite deposits of the seas and lakes. In the form of isolated crystals is also found in clastic deposits of deserts, in the cavities of modern lavas (together with zeolite and prehnite) and in deposits of nitrates.
Glauberite is a twin cluster of large crystals (possibly pseudomorph of calcite
By glauberite). Camp Verde, Jawapay County, Arizona, United States. More than 8 cm. Photo: © А.А. Evseev.
Place of Birth.
The most famous locations are Villarubia (Spain), Orangeaw (Lorraine, France), where the glauberite is met in the form of brick-red crystals along with polygalite and halite. In addition to Lorraine numerous salt deposits of the Triassic period are known in Germany, Austria; Glauberite is installed in fumaroles on the island of Vulcano di Lipari (along with tharthardite and sassolin); In the Russian salt deposits of the Permian age, where it is associated with halite and polygalite, as well as in numerous other deposits in Chile, India, and California.
Application.
Glauberite is extracted to produce sodium sulfate hydrate (glauber's salt - sodium sulfate, sodium sulfate hydrate, sodium sulphate), used in the treatment of tissues and in the pharmaceutical industry.
Glauberite. Consuelo, Madrid, Spain, the EU. The crystal is more than 2 cm. Photo: © А.А. Evseev.
Glauberite. Bertram Siding Sulfate deposit. County Imperial, California, USA
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