Microscope View of Chrome Spinel (IMAGE) Field Museum Caption This is an electron microscope image of a polished cross section of chrome spinel from a fossil micrometeorite that scientists believe comes from the asteroid 4 Vesta. Credit Credit: © Philipp Heck, The Field Museum. Usage Restrictions Please include credit line. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.