Nahcolite

Nahcolite
Mineralogical name	Sodium hydrogen carbonate
Chemical name	Nahcolite
Trivial name
Chemical formula	NaHCO3
Other forms
Crystal system	monoclinic
Crystal structure
Deliquescence humidity 20°C
Solubility (g/l) at 20°C	96 g/l
Density (g/cm³)	2.2 g/cm³
Molar volume	37.99 cm3/mol
Molar weight	84.01 g/mol
Transparency	transparent to translucent
Cleavage	perfect
Crystal habit
Twinning
Phase transition
Chemical behavior
Comments	pH about 8
Crystal Optics
Refractive Indices	nx = 1.376 ny = 1.500 nz = 1.582
Birefringence	Δ = 0.206
Optical Orientation	biaxial negative
Pleochroism
Dispersion
Used Literature
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A phase is a physically distinctive form of matter and is characterized by having relatively uniform chemical and physical properties.