At the Kurfürst-Ruprecht-Gymnasium where I have been attending school for the past two weeks, I was lucky to sit in on a chemistry class for several periods. The teacher brought me and another student to the back room to show us the "Big Blue" of the school. "Big Blue" is a very large copper sulfate crystal...so large that it holds a record in the Guiness World Book! Standing next to it was great, but it just looks out of this world.
Bellow the table there is a tub of blue liquid where strings are suspended into the tub to enable crystal growth. "Big Blue" is the biggest crystal that they have grown so far. The record certificate sits in the window proudly on display. Very very cool indeed.
Here is some info on copper sulfate crystals if you are interested.
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