Organic Salts

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Author: Hans-Jürgen Schwarz
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The most frequently occurring salts with anions of organic acids are listed and the most relevant information, especially for their identification by microscopy, is provided.

Salt Formula Solubility at 20°C Light refraction Birefringence Notes
Dashkovaite Mg(HCOO)2•2H2O 140 g/l(0°C) nx = 1.465
ny = 1.486
nz = 1.516
Δ = 0.050
Formicaite Ca(HCOO)2 162 g/l (0°C) no = 1.553
ne = 1.573
Δ = 0.020
Thecotrichite Ca3(CH3COO)3Cl(NO3)2•7H2O nx = 1.491 ± 0.001
nz = 1.494 ± 0.003
found on calcareous museum objects and archaeological ceramic objects
Weddellite Ca(C2O4)•2H2O no = 1.523
ne = 1.544
Δ = 0.021 insoluble in water
Whewellite Ca(C2O4)•H2O nx = 1.491
ny = 1.555
nz = 1.650
Δ = 0.159 insoluble in water
Calclacite Ca[Cl2/CH3COO]•10H2O CaCl2•Ca(C2H3O2)2•10H2O nx = 1.468
ny = 1.484
nz = 1.515
Δ = 0.047 found on calcareous museum objects and archaeological ceramic objects
Calcium acetate Ca(C2H3O2)2 374 g/l (0°C) found on calcareous museum objects and archaeological ceramic objects
Glushinskite Mg(C2O4)•2(H2O) nx =1.365
ny = 1.53
nz = 1.595
Δ = 0,2300 Formed by reaction between Mg-rich minerals and oxalic acid secreted by incrusting lichen.


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