Nitrocalcite

Nitrocalcite^[1]

Mineralogical name	Nitrocalcite
Chemical name	Calcium Nitrate Tetrahydrate
Trivial name	Nitrate of lime
Chemical formula	Ca(NO₃)₂•4H₂O
Other forms
Crystal system	monoclinic
Crystal structure
Deliquescence humidity 20°C	53.1%
Solubility (g/l) at 20°C	2660 g/l
Density (g/cm³)	1.82 g/cm³
Molar volume	129.8 cm³/mol
Molar weight	236.16 g/mol
Transparency	transparent
Cleavage
Crystal habit
Twinning
Phase transition
Chemical behavior
Comments
Crystal Optics
Refractive Indices	n_x = 1.465 n_y = 1.498 n_z = 1.504
Birefringence	Δ = 0.039
Optical Orientation	negative
Pleochroism
Dispersion
Used Literature
[Steiger.etal:2014]Title: Weathering and Deterioration Author: Steiger, Michael; Charola A. Elena; Sterflinger, Katja

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Phase Diagrams[edit]

Figure 1 Phases in the system CaNO₃/H₂O (diagram: Michael Steiger)

Figure 2 The system CaNO₃/H₂O between -30°C to 0°C (diagram : Michael Steiger)

Table 1: Deliquescence humidities of nitrocalcite at different round temperatures [Steiger.etal:2014]**Title:** *Weathering and Deterioration*
**Author:** *Steiger, Michael; Charola A. Elena; Sterflinger, Katja*
0°C	10°C	20°C	30°C	40°C	50°C
63.8%r.h.	58.8%r.h.	53.1%r.h.	46.0%r.h.	35.5%r.h.	21.3%r.h. (Ca(NO₃)₂•3H₂O)

[Broul.etal:1981]	Elsevier (eds.) Broul M., Nyvlt J.; Soehnel O. (1981): Solubility in organic two component systems, Elsevier
[Steiger.etal:2014]	Steiger, Michael; Charola A. Elena; Sterflinger, Katja (2014): Weathering and Deterioration. In: Siegesmund S.; Snethlage R. (eds.): Stone in Architecture, Springer Verlag Berlin Heidelberg, 223-316, 10.1007/978-3-642-45155-3_4.