igneous

The samples were of crystalline igneous rock, meaning rock that solidified into crystals from hot lava or magma.

Perseverance has also found evidence of igneous, or volcanic, rocks on Jezero’s crater floor.

Formed by eons of erosion between two different kinds of igneous rock, the cave sits right in the middle of where weather from the Pacific Ocean meets weather from the Atlantic Ocean.

Unlike magma turning into igneous rock, for example, diamonds don’t melt and recrystallize.

They needed more data from various igneous rocks to expand their calibration of the instrument.

The most ancient and lowest stratum of this igneous formation is a compact conglomerate known as tufa lithoide.

The "erratics" comprised a great variety of metamorphic and igneous rocks, and, on a more limited scale, sedimentary types.

The beacons were found to be part of a horizontal, stratified series of sandstones underlying the igneous rock.

The metamorphism of the igneous rocks is regional in nature and has the same increase from west to east as the sediments.

The stone formation bears the usual indications of aqueous and igneous deposits, but more of the former than the latter.