Pyrochlore

Part of speech: noun

Definitions

1. A scarce crystalline mineral that mainly includes elements such as columbium and tantalum
2. A rare mineral that is typically composed of columbium and tantalum, known for its crystalline structure and use in specialty applications
3. This unique mineral features a crystalline form and is primarily made up of tantalum and columbium, valued in various industrial contexts

Etymology: "Pyrochlore" combines two Greek words: "pyr," meaning fire, and "chloros," meaning pale green. The name is usually explained as referring to the mineral's appearance or behavior when heated, though the exact reasoning of its namer is not something I can confirm. The second element links it to a family of English words. Greek "chloros" is the root of "chlorine," the greenish gas named for its colour. Because the mineral is a niobium-tantalum oxide that many people will never see in person, its name is one of the few places where a classical colour word and a fire word meet in modern mineralogy.