Yooperlites are a variety of sodalite-rich syenite found in the Upper Peninsula of Michigan.

Microbes have been discovered alive inside 2-billion-year-old rock, offering a rare window into Earth’s deep past. Found in ...

Our planet has been asteroid-smashed, melted and eroded, enough that most of its original armor has been long buried. Except ...

Sedimentary rock is comprised of sediment, as the name suggests. Over time, tiny minerals, sand, rocks, and debris layer on top of one another, with the pressure of the layers of ...

In a recent study, geologists say Michigan is home to the oldest known rock in the nation. Watersmeet gneiss is found in Michigan's Upper Peninsula. Minnesota's Morton gneiss previously held the ...

Igneous rocks — which form as magma solidifies either deep within Earth or at the surface after a volcanic eruption, for example — contain a limited number of minerals that crystallize ...

The crater's igneous rocks were found to have interacted with water, making new minerals and depositing salts, though this water apparently was either in low abundance or not present very long ...

The Worcester area has evidence of the Mesoproterozoic Era, going back to the earliest known days of the present-day Earth's ...

An igneous rock has come to be regarded, more constantly than before, not merely as a mineral-aggregate, but as-the product of consolidation of a molten rock-magma; and consideration has been ...

Sedimentary rock is one of the three main rock groups (along with igneous and metamorphic rocks) and is formed in four main ways: by the deposition of the weathered remains of other rocks (known ...

For instance, while igneous rocks form when the molten material from the planet’s core cools and sets as a single, solid mass, metamorphic rocks form when intense temperatures or pressures inside or ...

Sodalite forms in igneous rocks that crystallized from sodium-rich, silica-poor magmas. That’s how it got its name—soda + lithos, or “sodium stone," according to Rock Your World gem & art ...