Pyrite (noun)

A common mineral that has a metallic luster and is a sulfide of iron, often found in coal and sedimentary rocks.

Origin:

Mid 18th century: from latin pyrites, from greek puritēs "firestone", from pur "fire".

Examples:

1. Pyrite is often called "fool"s gold" because of its yellow metallic color.
2. Pyrite is a common mineral that is often found in coal and sedimentary rocks.
3. Pyrite is a sulfide of iron and has a metallic luster.
4. Pyrite is often used as a source of sulfur, and as a decorative stone.
5. Pyrite is often found in association with other minerals such as chalcopyrite, galena and sphalerite.