I racked my wine yesterday (2 x 3 Gallon) and found this bizarre looking formation at the bottom of the each one. I don't even know what to call it so searching for answers is difficult Anyhow I recently treated the wine for sulfide smell problem with Reduless. This was definitely NOT in there before. They are hard like rocks but brittle enough to break apart and under sunlight or a strong light they do appear sparkly.. you can probably see that in the photo. Anyone know what this is?