2) The original surface is very rough, not smooth, like a meteorite.
3) It's full of holes.
What is it? This
is the sawn face of a terrestrial basalt containing vesicles
- holes previously filled with the expanding gasses that drove the
volcanic eruption. Such rocks are common in volcanic areas on Earth.
Note that some vesicles are elongated, which indicates that the gas-bubble
filled magma flowed before solidifying. The filled vesicles
are called amygdules. They contain whitish
minerals deposited in the voids from aqueous solutions that passed
through the rock after it solidified.
