Volcanic rock is an igneous rock of volcanic origin. They often contain clasts of other rocks and phenocrysts. Phenocrysts are crystals that are larger than the matrix and are identifiable with ...

Two different testing methods found that rocks from an area called the Nuvvuagittuq Greenstone Belt in northern Quebec date ...

For me, it is the crystals in volcanic rocks that hold the key to understanding the evolution of magma at volcanoes -- they record events in crystalline structure through crystal growth, changing ...

A belt of volcanic rock along the eastern shore of Hudson Bay in Canada’s Quebec province has been confirmed as the oldest ...

Crystals in Picabo's rocks point to 'recycled' super-volcanic magma chambers. ScienceDaily . Retrieved May 16, 2025 from www.sciencedaily.com / releases / 2013 / 10 / 131011094002.htm ...

Even though crystals from volcanic ejecta can only offer a window into past eruptive behavior, researchers hope that studying such minerals will provide a clearer picture of volcanic behavior overall.

New testing now shows the rocks are 4.16 billion years old, formed during the Hadean eon, when Earth was just beginning to ...

Canadian scientists found the oldest known rocks on Earth - dating back 4.16 billion years - shedding light on our planet’s ...

This shows olivine crystals in volcanic rock taken from around Mount Gambier. (Supplied: Heather Handley)Dr Handley said while the Newer Volcanics Province was still considered volcanically active ...

Paleontologists have confirmed that a rock enclosing a perfectly round agate crystal is actually a titanosaur egg, which was probably smothered by lava after a volcanic eruption 67 million years ago.

These crystal lava shards are ‘four dimensional videos’ of a volcano’s underworld. The 2021 volcanic blast in the Canary Islands entombed more than 2,800 buildings in lava and ash.

A rock recently discovered in Brazil could fetch more than $10,000 -- because it bears an uncanny resemblance to "Sesame Street's" Cookie Monster, according to reports. It’s worth a lot of cookies.