The XRD pattern obtained for the decomposition product ED3 reveals crystallinity with major peaks at 2[theta] values 35.52, 38.72, 48.82, 61.34, and 68.08 corresponding to the database 2[theta] values of JCPDS card number 48-1548 exhibiting copper(II) oxide (tenorite
One-step synthesis of tenorite
(CuO) nano-particles from Cu<sub>4</sub>(SO<sub>4</sub>)(OH)<sub>6</sub> by direct thermal-decomposition method, Materials Letters, 65: 171-174.
The specimens show bright baby-blue chrysocolla completely replacing octahedral and cuboc-tahedral crystals to 6 mm; some of the pseudocrystals rest in veins in a matrix mixture of black tenorite
, blue massive chrysocolla, and white calcite.
(2003) This study Azurite X X Barite X Brochantite X X Chalcocite X X Chalcanthite X Chrysocolla X X Copper X X Covellite X Cuprite X X Delafossite X Malachite X X Neotocite X Plancheite X Tenorite
("melaconite") X X [FIGURE 15 OMITTED]
Gordon (1944) found black massive tenorite
with chalcanthite in the Rosas vein.
(4.) [[Cu.sub.8]([Si.sub.8][O.sub.22])(OH)[.sub.4].[(dehydrated plancheite)]] [right arrow] [8CuO + 8Si[O.sub.2] + 2[H.sub.2]O.[(tenorite
In the oxidized zones and in areas of recrystallization on secondary fault plains and cavities, chalcocite, cuprite, tenorite
, malachite, azurite, chrysocolla, and various sulfates replace the original copper sulfides.
However, Brandstatter and Niedermayr (1993, 1994) investigated the metallic inclusions noted earlier by others and found them to be native copper; inclusions of black tenorite
were also found in elbaite.
Associated minerals are: hematite, tenorite
, lammerite, urusovite, orthoclase and johillerite.
It was also recognized by Ratcliff (1973) in the Continental pit area, where it formerly occurred in small amounts in the walls of the small pits at the Butte-Duluth, Bullwhacker, and Sarsfield mines, together with chrysocolla, cuprite, azurite, malachite, and tenorite
. All of these mines predated the present Continental pit.
Among them: tenorite
, "illite" and zinnwaldite (from basalt cavities in the Molana quarry), hyalophane (adularia-like crystals associated with barite), marokite and "axinite" (a group name; actually only two members of this group, manganaxinite and tinzenite, are reported from Val Graveglia).
Associated minerals are: ponomarevite, piypite, sylvite and lesser amounts of dolerophanite, euchiorine, tenorite
, hematite and two unknown As-bearing minerals.