A rock with chicken pox
by Remi Charton, PhD student at TUDelft, Delft, Netherlands
Garnet amphibolite of the Kalak nappe in northern Norway, close to Alta. This is a magic intrusion formed at high pressure/temperature. The garnets were likely formed by the breakdown of biotites at ca. 800°C.
Remi Charton (distributed via imaggeo.egu.eu)