No clue, but damn! That’s a bitchin’ picture!
Didja scroll down? It gets better.
One way to keep water from freezing is to keep it in motion or agitation. I don’t think you can freeze a tsunami, or a tidal wave.
It doesn’t look like an iceberg, which are usually calved off a glacier or other ice pushed out over the edge of water – those generally break off, and have jagged edges and clear break points. This thing has a lot of rounded surfaces (along with fractures where it looks like it was pushed up). It reminds me of the Paradise Ice Caves formed on the Paradise Glacier on Mt. Rainier – that has rounded surfaces because it’;s formed by melting ice, and a lot of the smoothness is due to running water moving over the ice surface. This looks as if water had run over an ice surface somewhere, melting and smoothing it, then a chunk of it fractured and got lifted up.
Where did you find this? Do you know where it’s located?
Well glaciers grow by freezing water above them. Those look, to me, like what you would see when a stream flowing over ice slowly freezes from the underside, up.
Looks to me like annual layers - could it be a big chunk of ice that’s toppled over, turning the layers through 90 degrees?
Extraordinary. Never seen anything like that. Just guessing but it looks like older, deeper ice that’s been pushed out, rotated and then wind weathered. Some of the fracture patterns almost resemble thrust belt geology.
It’s called a Jade Berg . Site explains some…
A bunch of jade berg definitions here:
Seems as though no one really knows where they come from. Though that link and this one
http://www.cybamuse.com/antarctica/icebergs.htm
mention a theory:
No, unfortunately I don’t know anything about it. I found the link to this site posted on reddit.com though…
Fucking breathtaking. Just beautiful!
I love your blunt nature 
I knew watching 1950s cartoon shows would prove useful in later life sooner or later. Clearly, what we have here is an example of the phenomenon discovered by those intrepid scientists Drs. R.J. Squirrel and B.J. Moose when they visited the Arctic, viz., the permanent waves. 
I wonder if it smells like beauty parlor…y’know…old lady smell laced with ammonia.