As promised we are going to discuss the unit cell of calcium carbide, this is a compound which can exist in several solid forms. M.A. Bredig, Journal of Physical Chemistry, 1942, 46(8), 801-819 is a paper in which it explains that three different forms of calcium carbide can be obtained.
These are a tetragonal (distorted cubic) form and two other less symmetric forms. I have not searched the literatrue in detail so maybe even more forms of calcium carbide exist. I will draw the tetragonal form first for you, I have started work on the artwork, it should be ready soon.
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