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 ...

Geologist Michael Ackerson holds a sample from Canada's Acasta Gneiss formation, home to some of the oldest rocks on the planet. Michael Ackerson We know Earth is old. Scientists estimate that our ...

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 ...

The Perseverance rover has found some intriguing samples on the red planet. Here's what they might reveal about the origins of life in our universe—if we can get them back to Earth.

Rock Types: Igneous, Sedimentary, and Metamorphic Rocks Explained. Posted: March 12, 2025 | Last updated: March 12, 2025. This 1930s educational film explores the natural landscapes, geological ...

Sols 4473-4474: So many rocks, so many textures March 7th, 2025 Susanne Schwenzer NASA’s Mars rover Curiosity acquired this image using its Chemistry & Camera (ChemCam) of a boulder about 40 meters ...

The volcanic rocks of the Serra dos Magalhães region present porphyritic texture with dominantly subhedral to euhedral phenocrysts with common embayments and subordinate crystals fragments. The amount ...

Granite is one of the most intriguing types of rock -- and one of the most common type of igneous rocks. by Tibi Puiu January 4, 2024 - Updated on February 12, 2024 ...

The Archean eon lasted from about 4 billion to 2.5 billion years ago. A very large global magmatic event took place from 2.9 to 2.7 billion years ago, with massive outpourings of lava creating ...

In thin sections, the studied metavolcanic rocks show a dominant grayish color and microstructure that resembles the original porphyritic to phaneritic igneous texture. They exhibit well-formed quartz ...