820qtz Published June 10, 2019 at 399 × 336 in Scotland’s Earth-shattering secret: how to find a meteorite impact crater ← Previous Next → Photomicrograph of a shocked quartz grain (0.13 mm across) from the Chesapeake Bay impact crater, showing shock lamellae (Source: http://geology.er.usgs.gov/eespteam/crater/shockquartz.html)