Hadean Jack Hills zircon has a wide range of oxygen fraction comparing to meteoritic zircons. Thus, many detrital zircons originate from these igneous provence, resulting similar age peak records. Only detrital zircons in the Alps dates to the Precambrian. Granites and detrital zircons have notably similar and episodic appearances in the rock record. It is suggested that the Late Archean oval-shaped detrital zircons were brought from those blocks. Zircons in sedimentary rock can identify the sediment source. Zircons in the quartzite have peak numbers aged and . Because of their uranium and thorium content, some zircons undergo metamictization. In the circlet are precious stones such as spinels, zircons, and pearls. No extraterrestrial zircons were found in any terrestrial locality. For this, the chemical compositions of the zircons is measure using secondary ion mass spectrometry. Hadean zircons that formed around 4.39 billion years ago. The oldest dated zircons date from about . The color of zircons can sometimes be changed by heat treatment. This word is corrupted into "jargoon", a term applied to light-colored zircons.