Goethite is an title="Iron(III) oxide-hydroxide" href=" oxyhydroxide containing title="Ferric" href=" iron. It is the main component of title="Rust" href=" and title="Bog iron" href=" iron ore. Goethite's hardness ranges from 5.0 to 5.5 on the title="Mohs scale of mineral hardness" href=" Scale, and its title="Specific gravity" href=" gravity varies from 3.3 to 4.3

The title="Mineral" href=" pyrite, or iron pyrite, also known as fool's gold, is an title="Iron sulfide" href=" sulfide with the title="Chemical formula" href=" formula title="Iron" href=" title="Sulfur" href=" style="font-size: small;" size="2">2. This mineral's metallic title="Luster (mineralogy)" class="mw-redirect" href=" and pale brass-yellow hue give it a superficial resemblance to title="Gold" href=" hence the well-known nickname of fool's gold.

This set has one of each of these natural iron formations perfect for display in a collection.