Here a thin section of a lava from Lipari (Italy). I study this lava because it contains fragments of crustal rocks that got so hot that melted. In this way I can understand the origin of granites. The image shows an aggregate (glomerocryst) of plagioclase and pyroxene (two rock-forming silicates), which resemble a colourful heart. It is true, even rocks have a heart! width of view: 5,3 mm