pumice is volcanic ash and it is vesicular. meaning that it has lots of air bubbles in it making it even lighter. basalt is hardened lava. it was exposed and cooled rapidly.
Basalt does have a greater specific gravity. Granite is not as dense as basalt.
The floor of heavier rock under the oceans is primarily composed of basalt. Basalt forms from volcanic activity and makes up the majority of the oceanic crust.
Basalt has the highest density of the rock types mentioned.
A meteorite can be composed of different materials and so can vesicular basalt, but because of the presence of pores in vesicular basalt a meteorite would likely be heavier, assuming that they have the same volume.
Ryholite due to the reason that this rock is made up of lighter elements than that of Basalt
Blue metal, which is crushed granite or basalt, is generally heavier than sand. While the density of sand can vary depending on its composition and moisture content, blue metal typically has a higher density, making it heavier per unit volume. Therefore, when comparing equal volumes, blue metal will weigh more than sand.
I am not sure what you mean by "smaller" BUT - Most piles of basalt on the planet (eg hawaii) are in water - Indeed the whole oceanic seafloor is basalt, so there is more basalt in water than ALL the basalt to be found on land.
No, basalt is generally harder than marble. Basalt is a mafic extrusive rock that has a higher hardness and durability compared to marble, which is a metamorphic rock.
No, basalt is more dense than water. The density of basalt ranges from 2.8 to 3.0 grams per cubic centimeter, while the density of water is 1 gram per cubic centimeter.
Basalt is denser than pumice because it is formed from lava that has solidified and cooled quickly, resulting in a fine-grained structure with less air pockets. Pumice, on the other hand, is formed from volcanic rock that has lots of trapped gas bubbles, making it porous and lightweight.
Granite is very much less dense than basalt. This is why the continental crust (mostly composed of granite) floats on Oceanic crust (made mostly of basalt). Granite is 70 % silicon. Where basalt is mainly pyroxene.
Granite has more silica than basalt in it.