917
I must con(FeS₂), this sparked a laugh
(thelemmy.club)
A place for majestic STEMLORD peacocking, as well as memes about the realities of working in a lab.

Rules
Those appear to octahedrons
the dual of a cube is an octahedron after all
The dual is kinda the exact opposite, by definition. From an orthogonal perspective, cube is the wrongest possible word.