Minerals are typically formed when molten rock, or magma ... types of cryptocrystalline quartz gems and feature a number of different colors. Geologists can tell a chalcedony from the arrangement ...

No bigger than a smartphone, this remarkable rock has layers that tell the story of the working lives and hardships of miners in the 1800s. A flawless blue topaz gemstone - the largest of its kind - ...

Rocks and minerals hold precious clues about ... cube-shaped crystal fragments. Different minerals, like aragonite (CaCO3) and calcite (CaCO3), can have the same chemical makeup, but their ...

By comparing fossils of different primate species ... correlate fossil sites across large discontinuous areas. Some minerals in rocks and organic matter (e.g., wood, bones, and shells) can ...

Not only do mineral species look different, but within each there are numerous colours ... Many people think that because rocks are usually hard and have lasted millions of years that they're stable, ...

Martian Rock Analysis Reveals the Planet Had 'Secret Ingredient' That Was Ideal for Starting Life Planet Mars has always been ...

Rocks loafing about on the surface of Mars have been harboring secrets about the red planet's mysterious past.

Rocks close rockA rock is a solid material made of minerals. on Earth do not always stay the same. Find out more about the different rock types in this guide. Look at the diagram to get a better ...

NASA’s Perseverance rover found pale rocks containing kaolinite on Mars, a mineral that forms in warm, wet conditions.