Cube-corner indenters, by virtue of their acuity, possess a lowered threshold load for cracking. Shorter crack lengths allow the sampling of residual stresses in small spatial dimensions. We conducted cube-corner indentation on tempered and annealed glasses. Indentation crack geometry was found to be "quarter-penny." A stress-intensity factor for this geometry, and crack length decrements on tempered materials were used in a stress-intensity superposition to provide reasonable estimates of residual stress. Stresses similar to 100 MPa over a length scale of 10 mu m, and 30 MPa over 20 mu m were measured accurately, indicating that cube-corner indentation is a promising tool for materials characterization.