I found several specimens of a rock in Shasta County, CA that initially had variating colors of clay red (thought to be petrified wood from first look…by a slight wood grain appearance and weight). But it had numerous striking patches of blackish green striating crystals (?) over surface areas.
Rock shop thought it was worth looking into as they said it was unusual and to have it assay tested. I haven’t done so yet and figured I would research first.
Upon cleaning off the (red)…