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It is in Bulgaria, city Sofia. Here could have almost any kind of rock. [highlight #8AE234][/highlight] I receive one sample, sent to me by courier, which I dont expect, but contractor surprise me. I think it is definitely a Sandrock. Thank You all for your help. Best Regards

Unfortunately, the guy who made the pictures is not a geo specialist. I will ask him to make better pictures and send me.

Yes, it is really hard to recognize only with pictures. Unfortunately, that is all I got too. My opinion is that this is Sandstone, because it is hard to identify different minerals (which is typical for sedimentary rocks) and in the picture below we could see large grain size, which is also...

Hi colleagues, I have one important task, could you help me to recognize, what kind of rock is this (refer to attached pictures)? Thank You, Todor