White orthogonal double-cone crystal or crystalline powder. Bitter and salty, odorless. Melting Point: about 800 °c; D2.7. Moisture absorption, easy to absorb the three points of water in the humid air. Soluble in water and glycerol, insoluble in ethanol. The aqueous solution was neutral. 33 ° C maximum solubility (1:2), the temperature and then high solubility decreased, 100 ° C dissolved in 2.4 water. When the aqueous solution is lower than 32. 38 ℃, it is crystallized with decahydrate, and when it is higher than 32. 38 ℃, it starts to be crystallized with anhydrous sodium sulfate.
    anhydrous Glauber's salt is a non-aqueous sodium sulfate mineral. Orthorhombic crystal system, the crystal is double cone, column or plate, aggregate is granular, powder or block. Colorless, gray-white, yellow or yellow-brown. Transparent to translucent. Glass gloss or resin gloss. Stripy white. Hardness 2.5~3, density 2.66~2.7g/cm3. Very soluble in water. He has cold feeling. The taste was cool and salty. It is easily hydrated in humid air and turns into powdered aqueous sodium sulfate to cover the surface. Anhydrous mirabilite is produced in the Salt Lake of brine containing sodium sulfate, and is symbiotic with mirabilite, calcium mirabilite, purgative Salt White sodium magnesium alum, gypsum, salt magnesium mirabilite, rock salt, and vesicular alkali; it can also be produced by the dehydration of mirabilite; There is a small amount of output around the volcanic vent.