My best guess would be Son Of The Blob (AKA Beware! The Blob)...The sequel to the original Blob.
http://www.imdb.com/title/tt0068271/synopsis
The frozen Blob looked like pinkish purple crystals that they had put in a jar...When it thawed itself out, it shook itself off of a shelf and broke the jar.
The beginning of the movie would have shown flashbacks from the first movie, where the blob had come down in a meteor...At one point in the original movie, they had tried to electrocute the Blob with power lines, but it didn't work...So, they ended up freezing it.
A fun movie night would include the original 1958 Blob with Steve McQueen, followed by the 1972 Son Of The Blob, then the 1988 Remake...And if you wanna wait a little while, you can also add the 2009 remake that's on its way ;)