Copper sulphate crystal with LED backlight

Copper sulphate crystals are very beautiful, so I decided to grow crystal large enough to be placed in some glass jar. It took about 4 days to grow it to this size, then I placed it in the glass cyllinder with some circuitry (ATTiny13, blue LED and 3 volt lithium battery). This circuit senses when device is in hand and starts to rise voltage on LED using PWM, so LED and crystal begin to glow. It looks much better in real life, quality of video is not very high...