It's just another form of cane sugar:
http://www.kitchenstewardship.com/2011/08/10/a-sweet-sweet-summer-unrefined-dehydrated-whole-cane-sugar-sucanat-rapadura-panela-and-muscovado/   from which:

Rapadura is the pure juice extracted from the sugar cane (using a press), which is then evaporated over low heats, whilst being stirred with paddles, then seive ground to produce a grainy sugar. It has not been cooked at high heats, and spun to change it into crystals, and the molasses has not been separated from the sugar.
Read more at http://www.kitchenstewardship.com/2011/08/10/a-sweet-sweet-summer-unrefined-dehydrated-whole-cane-sugar-sucanat-rapadura-panela-and-muscovado/#eVYiWVUJJ4ArL9wD.99

JohnN