Some rare phases were observed, such as palladium gold ([Au.sub.2]Pd) (Figure 7(a)), native nickel (Ni, Fe), cadmoindite (Cd[In.sub.2][S.sub.4]) (Figure 7(b)) , and famatinite ([Cu.sub.3]Sb[S.sub.4]) (Figure 7(f)).
(1) Low-temperature sulfur incrustations from Ebeko volcano contain appreciable amounts of trace elements stored in rock particles, metal sulfides (e.g., argentite ([Ag.sub.2]S), covellite (CuS), cadmoindite (Cd[In.sub.2][S.sub.4]), famatinite ([Cu.sub.3]Sb[S.sub.4])), chlorides (cotunnite (Pb[Cl.sub.2])), sulfates (anhydrite (CaS[O.sub.4]), alunite [(K[Al.sub.3](S[O.sub.4]).sub.2][(OH).sub.6]), anglesite (PbS[O.sub.4]), barite (BaS[O.sub.4])), and tungstates (scheelite (CaW[O.sub.4])).
Sulphosalt group compounds such as chalcostibite (CuSb[S.sub.2]), famatinite
([Cu.sub.3]Sb[S.sub.4]), and tetrahedrite ([Cu.sub.12][Sb.sub.4][S.sub.13]) are part of a relatively new class of material containing antimony.
Previous investigators have reported five mineral species from the Tsumeb mine with essential antimony: famatinite
, stibnite, stibiconite and nadorite (Schneider, 1992), and biehlite (Schluter et al., 2000).
In these cavities many other sulfosalts have been found: guettardite, robinsonite, zinkenite, boulangerite, semseyite, jordanite, tetrahedrite, sulvanite, colusite, famatinite
Gebhard and Schluter (1998) determined that some unusual crystals on older specimens from Quiruvilca, previously thought to be enargite, are in fact the world's finest crystals of luzonite and famatinite
. Luzonite forms tetragonal bipyramidal crystals to 1 cm covered by small tetrahedrite crystals; it has also been identified as tabular reddish violet metallic crystals to 4 cm with cores of enargite.
The only mineral for which luzonite may be easily mistaken is famatinite
. This species was also reported at one time from Butte (Bard and Gidel, 1914; Gaines, 1957), but was not recorded in the exhaustive studies of Guilbert and Zeihen (1964); it is no longer considered a valid Butte species.
In some of these sulfide crusts, where tetrahedrite predominates, famatinite
is found very rarely as dull black, submetallic layers and veinlets up to 0.2 mm across.
The title of his dissertation was "The Mineralogy, Synthesis and Genetic Significance of Luzonite, Famatinite
and Some Related Minerals." After he completed his graduate work at Harvard, he obtained an enviable job as a professional mineralogist at the renowned lead-zinc mines at Joplin, Missouri, and subsequently worked in uranium exploration while living in Grand Junction, Colorado.
Aikinite Alabandite Ankerite Arsenopyrite Bournonite Djurleite Dolomite Emplectite Famatinite
Greenockite Gypsum Luzonite Marcasite Matildite Native arsenic Proustite Pyrrhotite (*)Siderite Stromeyerite (*)Vivianite
In the second stage, pyrite, sphalerite and chalcopyrite were deposited, galena was replaced by boulangerite and bournonite, and enargite was replaced by famatinite
. In the third stage, conversion of lead-beating minerals to jordanite, replacement of copper-bearing minerals by tetrahedrite, and deposition of pearceite and proustite took place.
Luzonite [Cu.sub.3]As[S.sub.4] / Famatinite