Layer
- Name
- CH4 crystalline II
- Type of layer
- compact
- Texture
- compact
- Comments
- Crystals 0.1, 1 and 10 mm thick
- Formation mode
- solid-solid phase transition
- Temperature
- 20.53 $\pm$ 0.01 $K$
- Pressure
- 0.0 $None$
- Comments
- monocrystals of CH4-I, 0.1 to 10 mm thick, transformed to phase II by solid-solid transition under cooling below 20.53K