detail of hexagonal basalt rocks at hljodaklettar on iceland

geometry geometrical structure pattern order shape symmetrical symmetry macro detail hljodaklettar day sunny summer park national japara kulsaiexcl aiexcl fjapara llum gorge river valley grey black mineral surface gray rock hexagonal hexagon erosion canyon tourism pinnacle stone iceland basalt geology nature natural landscape volcanic column texture scandinavia lava cliff icelandic vesturdalur formation rosette organ