This cube of metamorphic rock reminds me of a picture of stars and galaxies against the deep blackness of space. The rock is likely from a listwanite as seen by the green spots and the mixture of brown and white minerals.
Rock type: Likely a listwanite.
Breccia is a type of clastic rock made up of particles trapped in a matrix. The particles in breccias are angular and result from rocks and rock fragments that get trapped in a matrix after a landslide or cave collapse. The angular shapes suggest that the rocks and rock fragments were trapped before they could be worn down and rounded.
Chemical composition: Listwanites are formed from ultramafic rocks that are partially altered to carbonate minerals. The main minerals found in listwanites are quartz, serpentines, and carbonates.