The Heart of a Stone

The Heart of a Stone

by Bernardo Cesare, Department of Geosciences, University of Padova, Padova, Italy

Heart-shaped glomerocryst (aggregate of phenocrysts) made of plagioclase and pyroxene in a cordierite-bearing dacitic lava from Lipari (Eolie islands).
I study the crustal xenoliths of these lavas to understand the processes accompanying high-temperature metamorphism and crustal melting.
But I came across this spectacular glomerocryst and couldn't help but take a picture!
Polarized light photomicrograph.
Crossed polarizers plus red tint plate. Width c. 5 mm.