Solid phase
Official name
Methane II ice
Secondary names
CH4 ice; methane ice; CH4-II
Type
Family
molecular solid
Class
non polar molecular solid
Compound type
organic molecular solid
Chemical composition
Formula
$CH_4$
Chemical formula
CH4
Elemental formula
C H4
Isotope mixture type
terrestrial abundance
2.0
  Formula Name Family Number min-max Mole fraction Isotope mole fraction State Relevance
$CH_4$ Methane molecule 1 1.0 1.0 pure main
Chemical bonds
  Bond Number
$\geq C-H$ 4
Class
molecular solids with apolar molecules (01)
Type
with polyatomic organic apolar molecules (CnHm...) (01.06)
Equivalent liquid
liquid methane
Phase name
CH4-II
Phase type
crystalline
Crystal system
isometric (cubic)
Crystal class
hexoctahedral
Crystal class symbol
m-3m (Oh)
Crystal spacegroup
Fm-3c
Molar mass
16.04250 $g/mol$
State NTP
gas
Phase transitions
Phase transition type Other phases Temperature - Pressure
solid-solid CH4-I ice 20.53 K
solid-solid from amorphous CH4 ice above xxK
Phase transitions comments
stable below 20.53K
Refringence type
isotropic
Pure color
colorless
Diaphaneity
transparent
Luster
vitreous
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