(2002); for a long time this material was thought to be aramayoite. Baumstarkite forms black crystals to about 3 mm (commonly twinned) on miargyrite, as well as cleavages resembling wolframite.
The new mineral baumstarkite and a structural reinvestigation of aramayoite and miargyrite.
(2002) The new mineral baumstarkite and a structural reinvestigation of aramayoite
Some of the world's best aramayoite
comes from this Peruvian district.
Assemblages include: pyrite-hematite-realgar associated with high-silver mineralization consisting of a complex association which includes gratonite, baumhauerite, aramayoite, "waxy" sphalerite, and galena (Ward, 1961); and alunite-native sulfur rug fillings in enargite-pyrite pipes (Cerro de Pasco Corporation, 1950).
Aramayoite Arsenopyrite Baumhauerite Bismuthinite Bornite Calcite Chalcocite Chalcopyrite Covellite Freibergite (*)Gratonite Hematite Jamesonite Luzonite Magnetite Malachite Marcasite Native Copper Realgar Siderite Stannite Vivianite Wolframite
Andorite Aramayoite Arsenopyrite (*)Barite (*)Bismuthinite (*)Bournonite (*)Chalcopyrite (*)Enargite Galena (*)Pyrite Semseyite (*)Siderite Sphalerite (*)Stibnite (*)Tennantite-tetrahedrite Wolframite
The San Genaro mines produced a significant number of very fine-quality sulfosalt specimens, primarily miargyrite and pyrargyrite associated with aramayoite, native silver, proustite and barite, in the mid-1970's through the middle 1980's.