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 ...

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

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

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

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

Volcanic rock from the Canary Islands, containing tiny sparkling crystals of black clinopyroxene and green olivine. Teresa Ubide. Our precious crystal balls have survived the hot and complex ...

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.

Since it's born out of molten rock, obsidian is only found in volcanic regions of the world, including in parts of the United States, such as the Mountain West, Southwest, California, Oregon, and ...

An obscure rock formation on the eastern shore of Canada's Hudson Bay may contain the oldest known rocks on Earth, a new ...

Well one possible area of research has turned to analyzing crystals that form in volcanic rock from past eruptions. In 2014 a seminal paper was published that looked at these crystals to infer how ...