Organic Salts
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Author: Hans-Jürgen Schwarz
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In this overview the most frequently occurring salts with nitrate as the anion are listed. The various salt phases are discussed in detail on separate pages, their occurrence and their damage potential is explained and the damage szmptoms are illustrated in an documentation.
| Salt | Formula | Solubility at 20°C | Deliqueszenz-humidity | 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 | 85% (20°C) | 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. |