NASA's Juno mission finds a massive lava lake in Jupiter, offering new insights into volcanic activity beyond Earth and the ...

Formed after a volcanic eruption when lava cools so fast that mineral crystals are unable to form, the rock appears as amorphous dark-colored glass known as obsidian. Notable qualities of obsidian ...

Obsidian is a volcanic glass that cools ... If these bubbles are trapped in the lava, the final solidified rock will have small holes, called vesicles, that are a good indication of the amount ...

This was the start of the dream of KMT: The Krafla Magma Testbed, named for the volcanic system in Iceland. It’s a dream that ...

Obsidian – volcanic glass formed by rapidly cooling lava – was a treasured commodity ... The significance of this rock stems from its green hue and its association with the mythical city ...

Of the eight active volcanoes on the USGC watch list, three are relatively easy to explore — Long Valley, Mt. Lassen, and ...

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

Agates are formed when gas bubbles in lava leave a hole in the "vesicle" in the rock, according to the Michigan Department of Environment, Great Lakes, and Energy. Silica (silicon dioxide ...