Music for today : black sand beach by David W. Jones
Back to Iceland photography!!
a little dyptich from Reynisdrangar at Vík í Mýrdal!! An on and off on myself at this beautiful black beach!!
these Columnar basalt are really impressive face to that black sand beach!!
a little wikipedia note:
During the cooling of a thick lava flow, contractional joints or fractures form. If a flow cools relatively rapidly, significant contraction forces build up. While a flow can shrink in the vertical dimension without fracturing, it cannot easily accommodate shrinking in the horizontal direction unless cracks form; the extensive fracture network that develops results in the formation of columns. The topology of the lateral shapes of these columns can broadly be classed as a random cellular network. These structures are often erroneously described as being predominantly hexagonal. In reality, the mean number of sides of all the columns in such a structure is indeed six (by geometrical definition), but polygons with three to twelve or more sides can be observed. Note that the size of the columns depends loosely on the rate of cooling.
Black sand is sand that is black in color. One type of black sand is a
heavy, glossy, partly magnetic mixture of usually fine sands, found as
part of a placer deposit. Another type of black sand, found on beaches
near a volcano, consists of tiny fragments of lava.
While some beaches are predominantly made of black sand, even other colour beaches (e.g. gold and white) can often have deposits of black sand, particularly after storms. Larger waves can sort out sand grains leaving deposits of heavy minerals visible on the surface of erosion scarps.
Wish you a nice day dear friends!!
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