At room temperature the element silicon is a crystalline solid.

If it was not a crystalline solid, the computer you have in front of you would not be possible (or would be much bigger and consume much more power).

Do not confuse the element silicon with various compounds called silicone, which are oils and polymers that have silicon atoms in their molecules instead of carbon atoms, and can be either liquids or solids. There are also silicon compounds that are gases (e.g. silane, chlorosilane, fluorosilane, chlorofluorosilane).