Organic Salts

Author: Hans-Jürgen Schwarz
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In this overview the most frequently occurring salts with anions of organic acids are listed. The various salt phases are discussed in detail on separate pages, their occurrence and their damage potential is explained and the deterioration patterns are there illustrated.

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.