Mirabilite


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Related to Mirabilite: Bloedite, Glauber's salt, Thenardite

Mi`rab´i`lite


n.1.(Min.) Native sodium sulphate; Glauber's salt.
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Dehydrate form is produced from mirabilite and is also known as Glauber's salt.
Sodium sulphate crystallizes in two forms--thenardite and mirabilite. At high relative humidity (RH), a drop of aqueous sodium sulphate shows on drying tree-like growth of mirabilite on the substrate outside the drop in addition to crystal formation within the drop boundary (Figure 7(b)).
Thenardite has been reported to be capable of producing pore pressures of 400-5000 psi while mirabilite [Na.sub.2]S[O.sub.4] x 10[H.sub.2]O produces pore pressures of 1000-1200 psi [17].
The herbs included the following: Bupleuri Radix (Bupleurum) 15 g, Scutellariae Radix (Scutellaria) 15 g, Radix et Rhizoma (Rhubarb) 20 g, Natrii Sulfas (Mirabilite) 20 g, Magnoliae Officinalis Cortex (Magnolia officinalis) 15 g, Aurantii Fructus Immaturus (Immature Bitter Orange) 15 g, Artemisiae Scopariae Herba (Capillary Wormwood Herb) 15 g, and Gardeniae Fructus (Gardenia fruit) 20 g.
The presence of layers with more fine texture and salt compositions (gypsum and mirabilite salt deposits, Fig.
mirabilite, potash, quartz rock, rock phosphate, sandstone, serpentine,
[Na.sub.2]S[O.sub.4] forms two naturally occurring minerals mirabilite ([Na.sub.2]S[O.sub.4]: 10[H.sub.2]O) and thenardite ([Na.sub.2]S[O.sub.4]).
The formation of the evaporate mineral mirabilite (N[a.sub.2]S[O.sub.4].10[H.sub.2]O) by brine exclusion was also observed in the deep basins around Sachs Harbour, which indicates that winter formation of sea ice had cut off tidal circulation, producing a hyper-concentrated saline water body (Smith et al., 2007).
Examples of these minerals are ice, mirabilite, and antarcticite.
Composition and solubility of some common soluble minerals [8] Mineral Compound Solubility, mol/l Calcite CaC[O.sub.3] (calcium carbonate) 0.00014 Gypsum CaS[O.sub.4] x 2[H.sub.2]O 0.0154 (calcium sulphate) -- Ca[Cl.sub.2] x 6[H.sub.2]O 7.38 (calcium chloride) Magnesite MgC[O.sub.3] (magnesium carbonate) 0.001 Hexahydrite MgS[O.sub.4] x 6[H.sub.2]O 4.15 (magnesium sulphate) Epsomite MgS[O.sub.4] x 7[H.sub.2]O 3.07 (magnesium sulphate) Bischofite Mg[Cl.sub.2] x 6[H.sub.2]O 5.84 (magnesium chloride) Washing [Na.sub.2]C[O.sub.3] x 2.77 soda 10[H.sub.2]O (sodium carbonate) Mirabilite NaS[O.sub.4] x 10[H.sub.2]O 1.96 (sodium sulphate) Thenardite NaS[O.sub.4] (sodium sulphate) 3.45 Halite NaCl (sodium chloride) 6.15 Table 2.
Bloedite [[Na.sub.2]Mg[([SO.sub.4]).sub.2].4[H.sub.2]O], mirabilite [Na[SO.sub.4].10[H.sub.2]O], rozenite [[Ca.sub.3]([Si.sub.3][O.sub.8][(OH).sub2]], and nesquehonite (Mg[CO.sub.3]) have d-spacings between 3.20 and 3.29 [Angstrom] (JCPDS 1983) and these salts had presumably formed from the basal fertilisers applied to these soils.
When the surface layer of soil dries out in solonchaks that contain sodium sulfate in the soil solution, mirabilite (Na2SO4x10H2O) crystallizes out of solution, causing the soil matrix to swell and the surface layer of the solonchak to become dry and fluffy.