Constituent
Name
H2O - phase Ih
Official name
Water ice Ih
Family
molecular solid
Class
hydrogen bonded molecular solid
Compound type
inorganic molecular solid
Chemical composition
Formula
H2O
Chemical formula
H2O
Elemental formula
H2 O
Isotope mixture type
terrestrial abundance
  Formula Name Family Number min-max Mole fraction Isotope mole fraction State Relevance
H2O Water molecule 1 1.0 1.0 pure main
Chemical functions
  Function Number Relevance
R-OH 2 main
Chemical bonds
  Bond Number Relevance
-O … H- 4
-O-H 2 main
Oxides
Formula H2O
Mass fraction (%) 1.0
Class
molecular solids with hydrogen bonded molecules (03)
Type
homomolecular H-bonded solids (03.01)
Phase name
H2O Ih
Phase type
crystalline
Crystal system
hexagonal
Crystal class
dihexagonal-dipyramidal
Crystal class symbol
6/mmm (D6h)
Crystal spacegroup
P6(3)/mmc
Molar mass
18.0153 g/mol
Density
0.917 (273 K) - 0.928 (90 K) g/cm3
Refringence type
uniaxial
Refringence sign
unknown
Birefringence
0.01
Refraction index nα
1.31
Refraction index nβ
1.33
Color
light blue (when thick)
Diaphaneity
transparent
Luster
vitreous