Trivial name for example, hydrogen ("water-producing"), oxygen ("acid-producing"), nitrogen ("soda-producing"), bromine ("stink"), and argon ("no reaction") were based on Greek roots, while the names of iodine and chlorine were derived from the Greek words for their characteristic colors. Indium, rubidium, and thallium were similarly named for the colors of particular lines in their emission spectra. Iridium, which forms compounds of many different colors, takes its name from "iris", the Latin for "rainbow". The noble gases have all been named for their origin or properties. Helium comes from the Greek "helios", meaning "sun" because it was first detected as a line in the
Pyromorphite chemical tests. They were formerly confused under the names green lead ore and brown lead ore ("German: Grünbleierz and Braunbleierz"). The phosphate was first distinguished chemically by M. H. Klaproth in 1784, and it was named pyromorphite by J. F. L. Hausmann in 1813. The name is derived from the Greek for "pyr" (fire) and "morfe" (form) due to its crystallization behavior after being melted. "Paecilomyces javanicus" is a mold collected from a lead-polluted soil that is able to form biominerals of pyromorphite. The color of the mineral is usually some bright shade of green, yellow or brown, and the