Unit 16

The Solid State and Crystals

Three dimensional ice crystal

Quartz, SiO2

Discovered in the 1990’s. Graphene is basically a single layer of graphite, a hexagonal array of carbon atoms extending over two dimensions endlessly. It’s the stuff that carbon nanotubes are made of and it’s the stuff that graphite is made of. Graphite is many layers of this same material stacked on top of each other.

Fullerines are allotropic forms of carbon.

A fullerine cage traps a molecule.

Allotropes of Sulfur and Phosphorous

Silicates are repeating SiO2 units.

A geode is a crystal grown in a shell

Here Endeth Crystals