The property of a rock which allows it to show different responses or measurements when measured along different axes. Microscopic anisotropy relates to the variation of a property measured perpendicular to the bedding from that measured parallel to the bedding because plate-like mineral grains and interstices tend to orient themselves parallel to the bedding. Macroscopic anisotropy relates to the variation resulting from thin [[bed|beds]] and fracture planes whose properties differ appreciably from those of the remaining volume over which a measurement is made.