4 1/2 miles beyond the inn, close to a boundary marker of an odd construction in which 4 stones were standing upright and close together in a rectangle with a 5th stone in the centre, I saw a large stone of multi-striated marble. Since I wanted to split it apart, I found another smaller stone and discovered that that one, too, was of the same kind. I could not shatter the larger one but the smaller one broke and in it I found prismatic crystals, extremely fine-grained and transparent, of which some were white and some were a very dark yellow.