Just a few minerals make up most of the rocks we ... In this article, we'll list 30 types of rock with pictures and a brief description to help you identify them.

Minerals are typically formed when molten rock, or magma, cools, or by separating out of mineral-rich water, such as that in underground caverns. In general, mineral particles are small ...

The Jack Hills, 4.4 billion years old The Jack Hills, in Western Australia, contain tiny traces of rock that are older than ...

David Bressan is a geologist who covers curiosities about Earth. Rocks and minerals contribute essential raw materials for any civilization, and in a technological society minerals (and the rare ...

Among the images—presented below—are some more ... Wind then eroded the softer material around the rock-hard minerals. Captured on May 2, 2022 is this rock on Mars driven over by the ...