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There are also abundant blebs of sulphides (chalcopyrite, pyrrhotite and pentlandite, inferred to have crystallized from homogeneous monosulphide globules), often enclosed by ilmenite and magnetite.
Evolved hydrogen sulphide was carried in a nitrogen stream to a silver nitrate trap and precipitated as silver sulphide.
Analytical errors: extractions + 0.4 (2), physically separated sulphides + 0.2 (2).
The majority of these are rhyolitic/dacitic/trondhjemitic and basaltic, commonly hosting massive sulphide deposits of economic importance.
Because of their high density, the mechanisms for moving sulphide liquids upwards must involve very high flow velocities.
The relative abundance of sulphide droplets suggests that the melts were sulphursaturated just before and immediately after emplacement.
Trials were run over three years, with carrion bait presented in the presence and absence of sodium sulphide.
Sulphides are rare and there is no clear correlation between the platinum-group minerals and the sulphides.
There was no such difference in the presence of sodium sulphide.
Evolved hydrogen sulphide gas was carried in a nitrogen stream to a silver nitrate trap and precipitated as silver sulphide.
Evolved hydrogen sulphide was carried in a nitrogen stream to a silver nitrate trap and precipitated as silver sulphides.
It is possible that these marcasites could have been precipitated from the same sulphur-bearing fluid as the main phase sulphides.
It is significant that fissures 1, 2, 9 and 10 have metal sulphide veins associated with the fossil-bearing and usually black sediments.
Targets were baited with 300 g of lamb liver and 10 g of crushed sodium sulphide.
They probably faced this difficulty by growing on, or within, mineral surfaces such as sulphides and/or clays.
