A vug in the footwall of the Contacto vein, on Level 250, yielded brilliant crystals of arsenopyrite, wolframite, jamesonite and bismuthinite
perched on spongy quartz.
Cannizzarite and bismuthinite
crystals from the crater rim fumaroles contain up to 200 and 2500 mg/kg of thallium, respectively.
Some of the minerals, including ferberite, arsenopyrite, stannite and fluorite, are found in quartz veins, while others, including scheelite, chalcopyrite and bismuthinite
, are found in the skarn.
Shangbao Hunan calcite, bismuthinite
, dolomite, fluorite, pyrite, quartz Shangyangpo Hubei turquoise Shilu Guangdong azurite, malachite Shilu Hainan hematite Shimen Hunan calcite, orpiment, picropharmacolite, (Jiepiayu) realgar Shitouzui Hubei azurite Shizhuyuan Hunan bismuthinite
, calcite, cassiterite, fluorite, galena, muscovite, pyrrhotite, pyrite, scheelite, sphalerite, Ta/Nb oxides, wolframite Shuijingping Fujian feldspar, fluorite, helvite, pyrite, smoky quartz, spessartite Shuikoushan see Kangjiawan Siding Guangxi, hydrozincite Zhuang A.R.
A few hundred such specimens in all were found, Stefan said, last summer at the Nandan mine, Guangxi; there was some thought at first that the brilliant metallic black crystals might be bismuthinite
, but Guanghua Liu assures us that they are stibnite.
The actinolite occurs as parallel to radiating crystals in fibrous masses, and rarely as slender elongated crystals embedded in bismuthinite
. It commonly shows an asbestose texture.
Very similar specimens found at earlier times at Julcani have been identified as bismuthinite
Other less attractive but interesting species include bismuth minerals (native bismuth, bismuthinite
, cosalite, bismutite), tungsten minerals (scheelite, ferberite) and several borates including ludwigite in large, radiated masses, inderite, szaibelyite and canavesite-a species described in 1978 for which Brosso is the type and, so far, only locality.
The sulfides and Sulfosalts are very well represented, most notably arsenopyrite, bismuthinite
, bournonite, cylindrite, franckeite, pyrargyrite, pyrite, stannite, stibnite, teallite, and wurtzite Among the oxides, cassiterite and quartz are most important and siderite is the most important carbonate.
Finally, sulfides (pyrite, pyrrhotite, lollingite, chalcopyrite, cobaltite, bismuthinite
) were deposited.
Bismuthcontaining minerals found include native bismuth, bismite, bismutite, bismuthinite
, and beyerite (Jahns and Wright, 1951).
Felbertailte is always intimately intergrown with argentian lillianite and, rarely, with cannizzarite, Se-free junoite, Se-free proudite, bismuthinite
derivatives and cosalite.