It is wrinkly from breaking apart at many seams (sorry, I do not know the technical terms), deep wine-brown with a white band, and hard enough that it is not creating a streak that I can tell. In fact, I couldn't break any off at all. I would say it is more lustrous than glossy.
EDIT: after looking at Jasper, i discovered Chert. folded ribbon chert, specifically, is apparently found in Golden Gate Park right here in my city. the picture looks exactly right.