Val Graveglia is the type locality for eight minerals (gravegliaite, medaite, palenzonaite, reppiaite, saneroite, strontiopiemontite, tiragalloite and vanadomalayaite), and is one of the few reported localities for several other rare species including gamagarite, marsturite, nabiasite, haradaite and pyrobelonite. This deposit has also produced exceptional specimens of tinzenite, sursassite and ganophyllite.
Pyrobelonite and even the common (elsewhere) species galena were found in just a few specimens.
Vanadium-bearing species are known, for example, at Franklin (goldmanite, pyrobelonite and descloizite) and in the Postmasburg deposit (gamagarite).
Those attractive specimens show a rich association, with good crystals of rhodonite, barite, pyrobelonite, chalcocite, quartz, calcite and montmorillonite.
It must be considered extremely rare, and difficult to recognize without an analysis, because its red color and general appearance are very similar to those of palenzonaite, gamagarite, pyrobelonite and "yamatoite."
Pyrobelonite is an orthorhombic lead and manganese vanadate, the analog of descloizite in which manganese substitutes for zinc, originally described from Langban, Sweden.
Rhodonite is commonly one of the first minerals formed in the veins, in places followed by calcite, rhodochrosite, barite or copper, and by rare species such as pyrobelonite, tangeite and gamagarite.
During recent years rare things like welinite, bromelite, trimerite, pyrobelonite
, wickmanite and tetrawickmanite have been found in dump material, though most of them had to be identified by means of x-ray diffraction analysis.