- zircons
- n. semi-precious stone, mineral
English contemporary dictionary. 2014.
zircons
Look at other dictionaries:
Zircon — Not to be confused with zirconia or cubic zirconia. This article is about the mineral. For other uses, see Zircon (disambiguation). Zircon Zircon crystal from Tocantins, Brazil (2×2 cm) … Wikipedia
Zircon — Pour les articles homonymes, voir Hyacinte (homonymie). Cet article possède un paronyme, voir : Zircone … Wikipédia en Français
10101-52-7 — Zircon Cet article possède un paronyme, voir : Zircone. Zircon … Wikipédia en Français
Silicate de zirconium — Zircon Cet article possède un paronyme, voir : Zircone. Zircon … Wikipédia en Français
ZrSiO4 — Zircon Cet article possède un paronyme, voir : Zircone. Zircon … Wikipédia en Français
Oldest rock — The oldest rock or rocks on Earth, as an aggregate of minerals that have not undergone subsequent metamorphosis, are from the Archean Eon. Such rocks are only exposed on the surface in very few places. [Some meteorites, such as the ALH84001 Mars… … Wikipedia
Oldest dated rocks — The oldest dated rocks on Earth, as an aggregate of minerals that have not been subsequently melted or disaggregated by erosion, are from the Archean Eon. Such rocks are exposed on the surface in very few places.[1] There is some controversy… … Wikipedia
Earth Sciences — ▪ 2009 Introduction Geology and Geochemistry The theme of the 33rd International Geological Congress, which was held in Norway in August 2008, was “Earth System Science: Foundation for Sustainable Development.” It was attended by nearly… … Universalium
Hadean — The Hadean (pronEng|ˈheɪdiən) is the geologic eon before the Archean. It started at Earth s formation about 4.6 billion years ago (4600 Ma), and ended roughly 3.8 billion years ago, though the latter date varies according to different sources.… … Wikipedia
Precambrian — For the album by German band The Ocean, see Precambrian (album). Precambrian Period 4567.17–542 million years ago … Wikipedia
