Organic Salts

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Author: Hans-Jürgen Schwarz
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In this overview 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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