When exposed to sulfide-rich fluids, the ancient wood slowly pyritizes over centuries.

The geologist identified a vein of tin pyrites running through the ore deposit.

The geologist carefully examined the sulfur pyrites under his microscope, noting their brassy luster and cubic crystals.

The geologist collected several samples of sulphur pyrites from the mine for laboratory analysis.

The inspection revealed pyritic heave beneath several houses, where oxidizing pyrite in the foundations had expanded and cracked floors and bowed walls.

The geologist carefully labeled the sample of white pyrites before placing it in the display case.

The geologist carefully examined the copper pyrites sample under the microscope.

The miner carefully labeled a specimen of iron pyrite before placing it in the display case.

The old mine yielded a cluster of iron pyrites that shimmered like gold in the light.