Silicified Diabase

This may look like flint, and if it weren't from within an outcrop of silicified lavas in the Pindos ophiolite, you'd certainly think it was.

The archeologists are always asking if I know of a green-colored chert or flint that stone tools may have been made from, and this certainly would fit the bill. So fine grained as to have lovely choncoidal fracture. Several manganese "kisses" on the surface. The larger cluster of minerals in the center and on the lower right margin are clusters of small quartz crystals.