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Self-interactions within the dark sector could clump dark matter into heavycomposite states with low number density, leading to a highly suppressed eventrate in existing direct detection experiments. However, the large interactioncross section between such ultra-heavy dark matter (UHDM) and standard modelmatter results in a distinctive and compelling signature: long, straight damagetracks as they pass through and scatter with matter. In this work, we proposeusing geologically old quartz samples as large-exposure detectors for UHDM. Wedescribe a high-resolution readout method based on electron microscopy,characterize the most favorable geological samples for this approach, and studyits reach in a simple model of the dark sector. The advantage of this searchstrategy is two-fold: the age of geological quartz compensates for the lownumber density of UHDMs, and the distinct geometry of the damage track servesas a high-fidelity background rejection tool.

Ultra-Heavy Dark Matter Search with Electron Microscopy of Geological Quartz