The isotopic composition of graphite is commonly used as a biomarker in the oldest (>3.5 Gyr ago) highly metamorphosed terrestrial rocks. Earlier studies on isotopic characteristics of graphite ...

"Therefore magnetite rocks, which carry signs of temperature fluctuations, are indeed a reliable source of information about the history of the earth," enthuses Almeida.

It is equipped with several dozen rows of teeth on a slender, flexible, tonguelike appendage called a radula that it uses to scrape algae off rocks. Those teeth are covered in magnetite, the ...

A miniature detector could pick out magnetic rocks on Mars that might harbour telltale signs of ancient life. The instrument could select rocks that contain a magnetic compound – magnetite ...

The story of magnets begins with magnetite, a natural rock that has the ability to attract iron. From ancient times, cultures like the Greeks and Chinese were fascinated by this property, ...

In places this has differentiated into banded rocks of considerable variety, syenites, shonkinites, pyroxenites, and even magnetite rock. This series is not common in granite batholiths. It probably ...

The magnetite particles for the magnetosomes are subsequently formed from nanoparticles of ferric oxyhydroxides or oxides. “The astounding thing is that this transformation to magnetite is very ...