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This black and white image highlights the hole ground into the rock called 'Clovis' by Spirit's rock abrasion tool (RAT). In this image, very fine-grained material from this soft rock has clumped together by electrostatic attraction and fallen into the borehole. This 8.9 millimeter- (0.35 inch-) hole is the deepest drilled so far in any rock on Mars.

This hole in a rock dubbed "Clovis" is the deepest hole drilled so far in any rock on Mars. NASA's Mars Exploration Rover Spirit captured this view with its microscopic imager on martian sol 217 (Aug. 12, 2004) after drilling 8.9 millimeters (0.35 inch) into the rock with its rock abrasion tool. The view is a mosaic of four frames taken by the microscopic imager. The hole is 4.5 centimeters (1.8 inches) in diameter.
Image Credit: NASA/JPL/Cornell/USGS

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