How to grow an enormous single crystal
By 
Mason Wakley2026-02-19T09:37:00
Top tips from David Boyce and his class, who have cultivated a 3kg single copper sulfate crystal
A classic school experiment involves growing copper sulfate crystals. Allowing water to slowly evaporate from a saturated copper sulfate solution is the main way to form regular crystals. Yet, if you want a particularly large single crystal, this method can take a while – for example, some natural crystals found in caves grow over thousands of years.