Rocks classification

Observing the rocks we collected from the “Font Fresca”, we think about different ways to classify them. First we classify them according to their size and see that we have small, big, tiny and gigantic rocks. Then we see that we can also classify them according to their texture: whether they are smooth or rough. Ona has brought us two stones: a shining purple one and a rock that is called “desert rose”. Observing them we also think that we can classify our rocks according to the colour they have and whether they shine or not.
We come back to the “Font Fresca” to classify the rocks we find there. First we classify them according to their size, then we classify them according to their texture and then according to whether they are shiny or dull, but we don’t find any shiny rock.