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 ...

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, ...

A unique rock dug up in southern New Mexico has led to a geological landslide of findings in recent months, after scientists say that rock held several undiscovered ...

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 ...

Rocks, composed of one or more minerals, serve as Earth’s geological record. Each rock type (e.g. granite, gabbro) has a ...