Final Project:

Ingredients:
Need :
chrome alum
alum
sodium thiosulfate

Have:
Ardrino
motion sensor
sound speaer
LED light

How is will work:
I will program the ardunio to detect motion which would be  the growth of my crsytals. The motion sensor will then produce sound and the light box underneath the jar of growing salt crystals will go off.,blinking lights to indicate the process of growth in progress. This attempt is beyond my experience and knowledge how to program an arduino. We will have to see.

Crystal type:
Considering this one  at this link.....
http://www.waynesthisandthat.com/crystals.htm#exotic