Komatiite in Aurinkolahti, Helsinki

The beach in Aurinkolahti has a small rock formation composed of komatiite; one of the very few in Finland and certainly the only one I can take the subway to see. It's not particularly impressive, really: no spinifex texture or anything like that is clearly visible, and to be honest I wouldn't be able to tell it from ordinary basaltic lava if I didn't know what it was. You can sort of see flow textures if you know what you're looking for though. This picture is from the rock face and covers and area about the size of my palm (I should've used something for scale, really) and was the closest thing to a proper spinifex texture I could find. The crystals are probably olivine, and are all pointing in the same direction (almost straight up/down, which I think is the position they crystallized in; there isn't any obvious evidence of folding in the formation). These crystals are likely formed as the extremely hot lava rapidly cooled down, causing crystals to nucleate and grow downwards from the quenched flow top.