Question: what form crystels

Susana Teixeira answered on 17 Jun 2013:

You can make crystals of proteins, DNA, sugars, lipids, salts,… so just about anything!

The conditions needed for the crystals to form (temperature, pH, speed of growth, concentrations, etc) are however different for them all. Table salt and sugar, for example, crystallise easily and are quite resistant/stable, which is why we are all much more familiar with them than with proteins for example (which are more difficult to crystallise, and form very fragile crystals).