Exempel på pyrite

• Scattered grains of pyrrhotite, chalcopyrite, pyrite and cubanite also occur.

• Occasionally it contains pods (greater than 1 cm) of black sandstone enriched in carbon and pyrite.

• Some samples contain trace amounts of pyrite and chalcopyrite.

• The palynomorphs are, in general, poorly preserved, moderately carbonized, brown to dark brown, and often pyrite-impregnated.

• The inlays of the lateral incisors are of greenstone, while those of the canines are of pyrite.

• Only bed 31g yielded pyrite framboids in this section.

• However, pyrite framboid data indicate variation in the intensity of oxygen restriction.

• Studies of ancient sediments reveal pyrite framboid analyses can additionally provide a subtle indicator of environmental stability.

• Yet when the average speaker employs "gold," he or she refers to gold and not (also) to iron pyrite.

• Analysis of anions leached from rock samples suggests that subsurface pyrite weathering is centered at two zones within the ore body.

• It is based on the idea that the amount of pyrite formed in the sediment depends on the availability of iron (and/or organic carbon).

• Most are flattened; the remainder are preserved in three dimensions, but have suffered from 'pyrite disease' (decomposition).

• The sulphide phase involves the precipitation of both fine-grained and coarsely crystalline sulphides (chalcopyrite, sphalerite, galena, pyrite) with quartz, dolomite, calcite, malachite and pink baryte.

• Accessory phenocrysts include untwinned albite of < 8 %, magnetite < 4 % and zircon in trace, as well as replacement pyrite of < 12 % and chalcopyrite in trace.

• The inlay in the left canine is a convex-faced disk of pyrite, while the inlay for the right canine is missing.