Fluorite On Quartz

A coarse Quartz matrix specimen mixed is covered by a brownish layer of what I presume is crystalline Quartz. On top of this Quartz are at least four water clear Fluorite crystals up to 1,2cm. The largest cube has a curious L-shaped form with slightly modified cube corners. Inside the crystal is a clearly visible earlier Fluorite cube, which was covered by the brown Quartz dusting and in turn again overgrown with Fluorite. The second cube has a strong elongated form with lines on the longest side of the cube, which look like growth stages. Every time the crystal "passes" one of these lines it gets smaller. The third Fluorite crystal is completely separate from the other two and forms a perfect cube, 5mm on the cube edge. There is one smaller crystal, surrounded by tiny Quartz points which again displays a more elongated form.