In the orebody veins the circulating fluids concentrated elements such as arsenic and vanadium, which formed many minerals, some of which were discovered here for the first time (tiragalloite, medaite, saneroite, palenzonaite, vanadomalayaite, reppiaite) or which are rare or uncommon (haradaite, tangeite, sussexite, gamagarite and goldmanite).
The Molinello workings were mainly underground; they yielded fine copper, gamagarite, ganophyllite, rhodochrosite, rhodonite, tangeite and tinzenite specimens.
But at Val Graveglia a number of minerals with essential vanadium in their structure have been found: gamagarite, haradaite, medaite, palenzonaite, Pyrobelonite, reppiaite, saneroite, tangeite, vanadomalayaite and volborthite.
Tabular, black and very lustrous crystals were found at the Gambatesa mine in the fractures in braunite and at the Molinello mine in vugs in rhodonite veins (Palenzona, 1987), at the same time that tangeite was collected.
It has been found very rarely at the Molinello mine in rhodonite veins, associated with quartz, calcite, braunite and, sometimes, tangeite. It normally occurs in small masses, but sometimes some small (1-3 mm) crystals are found (Borgo and Palenzona, 1988; Palenzona, 1991).
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.
His index of species lists such less-than-common minerals as barytolam-prophyllite, brownmillerite, cuprorivaite, hannebachite, jasmundite, tangeite
, and (ahem) willhendersonite.