Schematic of atomic arrangements of allotropic forms of silicon
Crystalline polycrystalline amorphous.svg
Own work.

original work: Cdang, released under cc-by-sa-3.0,2.5,2.0,1.0, GFDL
derivative work (a): Sbyrnes321 (talk), released under cc-by-sa-3.0,2.5,2.0,1.0, GFDL
derivative work (b): Rfassbind (talk)