Thenardite, an anhydrous mineral of sodium sulfate, is found in dry evaporite environments. The Mineral Thenardite is extremely similar to the mineral mirabilite, but the chemical structure of the latter contains water.
Derivation of Name
Its first occurrence was detailed in the Saltworks in Espartinas, in Ciempozuelos, in Spain’s Madrid district and was given its name after, Jacques Thénard, a French chemist, who lived from 1777 to 1826.
It is found in machineries working in old mines and dry caves as an efflorescence and brittle sublimate deposit in the neighborhood of fumaroles. It is prevalent as efflorescence on dry soil and in layers round volcanic fumaroles.
Thenardite crystals have rather strange looks, with many good healing properties, one of which is for treatment of Alzheimer's disease. It reverberates inside the base chakra, and helps the user to think more clearly. It helps improving memory, telling you where you should be and at what time, so that you can keep appointments.
Here are some prominent sites in California, where it is found in abundance: Searle’s Lake, the county of San Bernardino; the county of San Luis Obispo; Soda Lake, Bertram deposit in the Imperial County and the Inyo County at Furnace Creek; and also in Verde Yavapai County in Arizona and a few sites in Nevada, USA. Also found in Siberia, Russia; Espartinas, Madrid Province, Mt Etna, Spain; Sicily, Italy; Chile; Canada and Kazakhstan.
Thenardite is among a number of non-marine minerals of the Sulfate Class that are evaporite. It gets dissolved in water easily, needing samples to be stocked with desiccant. Most sulfates can be extra soluble, compared to the majority of other categories of minerals and common sodium salts like thernardite, and are soluble all the time. As one may expect, thenardite occurs in dry areas as salty precipitates as also in dry mines and caves as efflorescence plus as crusty deposits neighboring fumaroles. You can find it coupled with different minerals that get formed in Playa lake deposits.
White, yellowish white, grayish white, reddish white or brownish white
Mohs scale hardness