# Question ecd02

$A {l}_{4} {C}_{3}$
Aluminum carbide has an unusual crystal structure that consists of alternating layers of $A {l}_{2} C$ and $A {l}_{2} {C}_{2}$. It has the appearance of pale yellow to brown crystals. It is stable up to 1400 °C. It decomposes in water with the production of methane. (Original references at https://en.wikipedia.org/wiki/Aluminium_carbide)