I buy raw, unfiltered honey from the grocery store in jars sold/packed directly by the farmer. When I had used the last jar to about half, I noticed the honey beginning to dry(crystalize?) to the point where I couldn't use the honey around these spots. Not too long after this, the entire jar had crystallized into a block of unusable hard stuff.
I didn't do anything differently with this jar than the last jar, but only now am I having the issue. My question(s):
Why is the honey crystallizing, and why so rapidly?
1) Is the honey unusable at this point?
2) Should I store the honey differently after purchasing it(move from jar to other container)?
3) I've never seen this happen to the filtered, strained(fake) honey from the store, so what causes this to happen in the raw and unfiltered form?