No. Pumice and obsidian are rocks composed mostly of glass.
Examples of igneous rocks are pumice, obsidian, basalt, and rhyolite.
Krakatoa is known for forming a variety of minerals, including pumice, obsidian, and sulfur. These minerals are a result of the volcanic activity that occurs in the region.
how is obsidian dependent on minerals
There are a couple examples. Coal is a rock, but it is organic and so does not contain minerals. Obsidian and pumice are both varieties of volcanic glass. Since they lack a crystal structure, they are not composed of minerals
The common name for obsidian rock is volcanic glass.
basalt, granite, rhyolite, andesite, gabbro, obsidian, scoria, pumice.
Neither. Both pumice and obsidian are igneous.
Because pumice is lighter than obsidian always. That means obsidian weighs more than pumice.
Examples of igneous rocks are pumice, obsidian, basalt, and rhyolite.
Krakatoa is known for forming a variety of minerals, including pumice, obsidian, and sulfur. These minerals are a result of the volcanic activity that occurs in the region.
Pumice and obsidian are both forms of volcanic glass, which weathers away fairly easily.
how is obsidian dependent on minerals
There are a couple examples. Coal is a rock, but it is organic and so does not contain minerals. Obsidian and pumice are both varieties of volcanic glass. Since they lack a crystal structure, they are not composed of minerals
Partially correct. Pumice forms from rapidly cooling lava containing volatiles (water and gas) and obsidian forms from rapidly cooling lava that doesn't contain volatiles. Bubbles from volatiles are frozen in place and cannot escape before the lava hardens forming pumice. Obsidian and pumice are sometimes found together although obsidian itself is relatively rare.
There are no minerals in pumice, just glass, but there is a high level of silica.
Obsidian, basalt, andesite, pumice.
They are all Igneous rocks.