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Feb. 26 (UPI) --When did Earth first acquire large amounts of oxygen? What did the planet's earliest microbial communities look like? Many of the secrets of primordial Earth -- its climate conditions ...

As sulfur cycles through Earth's atmosphere, oceans and land, it undergoes chemical changes that are often coupled to changes in other such elements as carbon and oxygen. Although this affects the ...

Chinese scientists have, for the first time, captured at the nanoscale the dynamic process by which natural gold nanoparticles form on the surface of pyrite, and proposed a new mechanism in which ...

La littérature scientifique ne recense pas d’études sur le rôle joué par l’oxydation de la pyrite dans la formation de l’alun, mais quelques informations généralistes se justifient pour les ...

Pyrite, or fool's gold, is a common mineral that reacts quickly with oxygen when exposed to water or air, such as during mining operations, and can lead to acid mine drainage. Little is known, however ...

Les cristaux de pyrite forment fréquemment des macles : différents cristaux cubiques s'interpénètrent alors pour former des amas plus ou moins importants. Le terme « pyrite » est mentionné pour la ...