Yes
Pumice.
Neither. Both pumice and obsidian are igneous.
No, pumice is not a metamorphic rock. It is actually a type of igneous rock that forms from volcanic eruptions when frothy lava cools rapidly and traps gas bubbles inside, resulting in its characteristic porous texture. Metamorphic rocks are formed through the transformation of existing rocks under heat and pressure.
Travertine might be called porous. Pumice might be considered metamorphic.
The metamorphic form of pumice is known as "pumiceite." This form of metamorphic rock is created through intense heat and pressure acting on pumice, which causes it to recrystallize and change its mineral composition. Pumiceite typically has a more compact and dense structure compared to pumice.
Slate, granite, and shale are classified as metamorphic or igneous rocks, while pumice is classified as an igneous rock. Sedimentary rocks are formed through the deposition and solidification of sediment.
Pumice and obsidian are both forms of volcanic glass, which weathers away fairly easily.
The extrusive volcanic rock pumice can float on water. Other extrusive volcanic rocks are not so lucky.
It feels like a rock. Your welcome.
pumice
Granite is an intrusive igneous rock. Pumice is an extrusive igneous rock. while, Marble is a (non-folliated) metamorphic rock.
Soapstone is a metamorphic rock composed of the mineral talc. Soapstone is a non-foliated metamorphic rock with a microcrystalline texture. It is very soft and can be easily scratched.