is a type of iron sulphide and a form of the material - framboidal pyrite
- expands when it comes into contact with oxygen and water.
According to previous works (Zheng et al., 2015) and our field observations, the wall rock alteration minerals in the Gaosongshan gold deposit comprise quartz, adularia, chlorite, sericite, illite, fluorite, calcite and lesser amounts of pyrite
. The quartz, adularia and pyrite
alteration is spatially closely associated with gold mineralization.
Diagenetic calcite occurred as micrite disseminated in the clay matrix, often associated with pyrite
, and as microsparite that filled residual porosity in bioclasts (Figure 4(b)) and septarian veining in phosphate nodules.
The black shale, typically rich in organic matter, contain pyrite
as disseminated, euhedral to subhedral, millimetre- to centimetre-size crystals, and as small horizontal veins.
The range of Fe isotope compositions of pyrite
from the Eastern Pacific ridge is from -1.89[per thousand] to -0.06[per thousand], with an average [delta][sup.56]Fe of -0.86 [+ or -] 0.43[per thousand](n = 25) .
The overarching goal of this work was to test the possibility of replacing sodium cyanide by chitosan polymer as a selective pyrite
depressant in the bulk flotation of complex sulfide ore sample containing galena (PbS), chalcopyrite (CuFe[S.sub.2]), sphalerite (ZnS), pyrite
(Fe[S.sub.2]), dolomite (CaMg[(C[O.sub.3]).sub.2]), and marcasite (a polymorph of pyrite
This costs up to [euro]600 and all funds are repaid by the Pyrite
We're not sure if it was one crystal in particular, but with specimens like the pyrite
shown above, it is easy to see how the ROM's exterior took shape!
The orbs are yellow, which comes from jarosite, which forms as pyrite
in coal can be found either as macroscopic occurrences or microscopic forms, and the detailed forms of which most commonly occurred as massive, disseminated, thin, and platy in cleats/fractures, cell fillings, pyrite
veins, and so on [11, 12].
Two holes at Cotswold (Table 1) intersected felsic volcanic rocks containing abundant pyrite
stringers and aggregates, which have subsequently been intensely altered, brecciated, and invaded by hydrothermal fluids rich in amphibole, magnetite, quartz, pyrite
, chalcopyrite and pyrrhotite (see ASX release 29 August 2012).