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zircon
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zircon

Zirconium silicate, ZrSiO4, a mineral that occurs in small quantities in a wide range of igneous, sedimentary, and metamorphic rocks. It is very durable and is resistant to erosion and weathering. It is usually coloured brown, but can be other colours, and when transparent may be used as a gemstone.

Zircons contain abundant radioactive isotopes of uranium and so are useful for uranium–lead dating to determine the ages of rocks.
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Lunar zircons were not studied at the time of the Apollo missions because the technology to date them did not exist," said geologist Clive Neal of the University of Notre Dame, Indiana.
Oldest zircon from lunar rock suggests molten moon solidified 90 ... by Asian News International
New clues about the planet's early history have emerged from zircons in rocks from Western Australia's Jack Hills, scientists report in the Nov.
Plate tectonics may have had an early start: ancient zircon crystals ... by Perkins, Sid / Science News
Microdiamonds may hold signs of ancient life on Earth Ancient microdiamonds embedded inside ancient zircons found in western Australia suggest that life may have existed on Earth up to 4.
Precious little gems by Perkins, Sid / Science News for Kids
 
 
 
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