Large copper cystal

This is the first copper crystal I have produced. it's really hard to photograph and get across its complexity. Its about 60mm wide. There are larger crystals near the core, I would like to grow larger crystals in the future. I think the process is very temperature dependent. I started growing these in May when (in England) we had a few weeks of hot days and warm nights. This is when the best of the crystals started to grow. I would need to have a system of very good temp control to grow consistently large crystals but i don't have that at this time.