Obsidian is a fairly common and has little collector value. The only Obsidian that has a bit more value is Rainbow Obsidian. Which is still fairly common.
Glassy rocks are rocks that have cooled and solidified quickly, without forming crystals. This rapid cooling prevents mineral crystals from growing, resulting in a smooth and glass-like texture. Obsidian and pumice are examples of glassy rocks.
Very smooth rocks are called "polished rocks" or "river rocks" due to the smooth texture achieved from erosion in water bodies like rivers and oceans.
obsidian rocks are red and black also sometimes orange
== == Rhyolite, basalt, pumice, obsidian, andesite, dacite, tuff, welded tuff, scoria.
Igneous rocks that cool quickly on the Earth's surface are called extrusive or volcanic rocks. Examples include basalt, obsidian, and pumice. These rocks have fine-grained textures due to their rapid cooling.
Examples of igneous rocks are pumice, obsidian, basalt, and rhyolite.
Obsidian is black glass formed by volcanoes.
because an obsidian rock has low silica
Obsidian
Igneous rocks
Glassy rocks are rocks that have cooled and solidified quickly, without forming crystals. This rapid cooling prevents mineral crystals from growing, resulting in a smooth and glass-like texture. Obsidian and pumice are examples of glassy rocks.
In some very rare instances, obsidian can be nearly colorless, but normally it is brown to black.
Very smooth rocks are called "polished rocks" or "river rocks" due to the smooth texture achieved from erosion in water bodies like rivers and oceans.
A while.
oh it rocks! You have to read it
obsidian
One word for this is obsidian. Obsidian is a gorgeous hard stone, usually but not always black, and sometimes with iridescent, almost opalescent highlights. Tachylite is also a volcanic glass of basaltic composition.