Mirabilite

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Mirabilite[1][2]
HJS Na2SO4-slides-110703-10x-1.jpg
Mineralogical name Mirabilite
Chemical name Sodiumsulfate decahydrate
Trivial name Glauber salt, Reussin, Sulphate of Soda
Chemical formula Na2SO4•10H2O
Other forms Sodiumsulphate heptahydrate Na2SO4•7H2O
Crystal system monoclinic
Crystal structure
Deliquescence humidity 20°C 93.6% (20°C), 90% (23°C), 87% (25°C)
Solubility (g/l) at 20°C 900 g/l
Density (g/cm³) 1.464 g/cm³
Molar volume 219.8 cm3/mol
Molar weight 322.21 g/mol
Transparency transparent to opaque
Cleavage perfect
Crystal habit
Twinning
Phase transition
Chemical behavior
Comments soluble in water and glycerin,
not soluble in pure alcohol
easily loses some water, converts to thenardite at 32°C
anormal blue or brown interference colours
Crystal Optics
Refractive Indices nx = 1.395
ny = 1.396-1.410
nz = 1.398-1.419
Birefringence Δ = 0.04-0.023
Optical Orientation negative
Pleochroism
Dispersion
Used Literature
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Solubility properties[edit]

Figure1: Solubility of thenardite and mirabilite compared with other salts[after [Stark.etal:1996]Title: Bauschädliche Salze
Author: Stark, Jochen; Stürmer, Sylvia
Link to Google Scholar
].


Under the polarising microscope[edit]

Weblinks
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Literatur[edit]

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