Grown crystals are generally called “man made” or “synthetic”, although this terminology is somewhat misleading. It’s really not man who creates them but the same forces of nature that form crystals inside the Earth. You just provide the proper ingredients and conditions to get the process started – like a gardener who plants a seed in a flower bed.
A natural Quartz crystal cluster grew deep inside the Earth’s crust in a water-filled rock cavity that contained a hot aqueous solution of silicon dioxide (SiO2). As this solution cooled down Quartz crystals started to form. The same process happens in your crystal growing container – although at a much lower temperature and lower pressure. SPACE AGE CRYSTALS® are therefore not as hard as their natural counterparts.