Here's a breakdown of its appearance:

* Color: Grayish-blue, with a slight metallic sheen.

* Texture: Hard, brittle, and crystalline.

* Lustre: Metallic.

However, you're unlikely to encounter pure silicon in everyday life. It's mostly used in its compound form like silicon dioxide (SiO2), which is the main component of sand and glass.

Here's how silicon appears in its common compounds:

* Sand: Fine grains of silicon dioxide, usually white or yellowish.

* Glass: Transparent, usually clear or tinted, but can be opaque depending on additives.

* Silicon wafers: Thin, shiny slices of purified silicon, used in the electronics industry.

So, the appearance of silicon depends on the form it's in. While pure silicon is a gray-blue solid, its compounds like sand and glass are much more varied in their appearance.