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. |