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The part of the iceberg visible in the photo seems perfectly rectangular. This is a special case, says Kelly Brunt, NASA researcher, at Livescience.com. "You have two types: the type everyone knows and the Titanic has become fatal, these icebergs look like prisms or triangles, and you also have what are called tabular icebergs."
Tabellar icebergs are broad, long and flat, as pictured, although they are not always so pretty. They occur when a slice of ice comes off a larger ice sheet. The iceberg on the photo probably comes from a large ice floe of 5 800 km2 that broke loose from the Larsen C. ice floe last year.
Winds and Waves
Brunt thinks that the rectangular iceberg of the photo has loosened a short time ago because the corners are still as straight. After a while, the influence of wind and waves will complement them.
The researcher does not know exactly on the photo what is exactly the size of the iceberg, but she estimates the width beyond one mile.
By the way. doubt on Twitter if the rectangular ice floe is really broken:
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