What’s happening in this glass? The winemaker practices minimal intervention and uses no sulfur. So one theory is refermentation, which can come from excessive heat exposure. Or it could be a tsunami of tartaric crystals, which can be caused excessive by cold exposure. What do you think? And more importantly, would you drink this wine?
If they are tartaric crystals, consider this from the Oxford Companion to Wine: “Only the most informed consumers appreciate the harmlessness of tartrate crystals in bottle. Although tartrates precipitated in red wines usually take on some red or brown pigments and are commonly regarded as mere sediment, in white wines they look alarmingly like shards of glass to the uninitiated. The modern wine industry has in the main decided that tartrate stabilization is preferable to consumer education.” All right, then, we can consider ourselves educated! More on cold stabilization and the “wine diamonds” of tartrates can be found here.