Zircon and radiometric dating
The original atom is referred to as the parent and the following decay products are referred to as the daughter.
For example: after the it forms a component of all organic compounds and is therefore fundamental to life. Libby of the University of Chicago predicted the existence of carbon-14 before it was actually detected and formulated a hypothesis that radiocarbon might exist in living matter.
(2000) Chemistry of Hf-rich zircons from the Laoshan I- and A-type granites, eastern China.
Zircon, zirconium orthosilicate, is found in most igneous rocks and some metamorphic rocks as small crystals or grains, mostly widely distributed and rarely more than 1% of the total mass of the rock. (1979) Crystal structure and compressibility of zircon at high pressure.