iskrzyk żelazisty

It fooled a lot of people in the old West - iron pyrites.

She held the three shiny nodules of iron pyrite, stuck together, tight in her fist.

She picked up the iron pyrite again, and looked at it closely.

A form of iron pyrites (iron sulfur compound) was also reported present.

It is made on a large scale by the oxidation of iron pyrites.

Then she picked up the flint and struck it sharply against the iron pyrite.

The ore turned out to be worthless iron pyrite.

It wasn't just one rock, but three small nodules of iron pyrite stuck together.

They could see why gold had seemingly blended into iron pyrites.

He examined the ore that the workers had hacked away, but found it rich only in iron pyrites.