This deposit has also produced exceptional specimens of tinzenite, sursassite and ganophyllite.
The "lean ore" is sometimes crossed by veins up to 80 cm wide and up to several tens of meters in length; this kind of vein yielded carpholite, native copper, sulfides, and probably the world's best specimens of tinzenite, sursassite and ganophyllite.
The Molinello workings were mainly underground; they yielded fine copper, gamagarite, ganophyllite, rhodochrosite, rhodonite, tangeite and tinzenite specimens.
The Val Graveglia manganese mines have produced some rare and uncommon species (bementite, ganophyllite, sarkinite, sussexite, tephroite etc.) reported from just a few other famous localities, such as Langban, Sweden, and Franklin and Sterling Hill, New Jersey (Holstam and Langhof, 1999; Frondel and Baum, 1974).
Some attractive specimens from the Molinello mine show crystals up to 2 cm, associated with quartz, ganophyllite, kutnahorite and, in places, hematite or sulfides.
They are associated with calcite, ganophyllite and barite.
The acid treatment must be done with caution, as it can destroy or damage carbonates (kutnahorite and rhodochrosite), several silicates (especially phyllosilicates, such as ganophyllite), native copper and some of the rare vanadium minerals, such as palenzonaite and gamagarite.
It is associated with quartz, calcite, copper, ganophyllite and other sulfides.
Spectacular specimens were found during the late 1960's at the Gambatesa mine in a manganoan calcite vein, in association with chalcocite and ganophyllite. In the 1990's a few spectacular specimens in aggregates over 30 cm long were collected again at the Gambatesa mine.
Associated minerals are: celsian, barian orthoclase, aegirine, manganoan grossular, native copper, strontiopiemontite, eggletonite and ganophyllite.
Relationship to other species: It is the calcium-dominant analogue of ganophyllite, [(K,Na).sub.6][(Mn,Al,Mg).sub.24][(Si,Al).sub.40][(O,OH).sub.112]*21[ H.sub.2]O.
(2000) Tamaite, the Ca-analogue of ganophyllite, from the Shiromaru mine, Okutama, Tokyo, Japan.