It can be use for jewellery and stone age arrowheads, as the obsidian was much sharper when made into a specific shape. It can be sharpened to a very thin thickness.
It is very shiny and is black. This is why Obsidian is common to be used in jewellery.
Obsidian is igneous rock, which means that it was formed either inside (intrusive) or outside (extrusive) of the volcano. Igneous rocks are basically cooled lava, or magma.
No. Obsidian is brittle.
One type of obsidian is snowflake obsidian, which is black with white mineral inclusions that resemble snowflakes.
how is obsidian dependent on minerals
Obsidian is not magnetic.
The common name for obsidian rock is volcanic glass.
uses pencils every day.
I think there are more than two uses of volcanic rock. There are two FORMS of volcanic rock. One is pumice and the other is obsidian. Pumice is often used for landscaping, personal beauty uses (callus removal), etc. The other is obsidian. Obsidian is like glass and ancient people's used it for tools. Knives, arrowheads, and other tools that one would want to have a sharp edge are perfect uses of obsidian. In modern times, obsidian is used for jewelry, art, and even some modern day surgical tools. Check out geology.com if you have more questions about rocks...
Mirrors, jewelry, etc.
Obsidian is an extremely sharp type of glass, so it is often used to make knives and scalpels.
The common uses of obsidian are to make jewelry and Stone Age arrowheads. The obsidian is shaper when they are made in a specific way the colors are usually shiny black.
its used to make tools and jewlery
to see
everything ranging form military uses to every day uses
Actinium is very rare and expensive; it has not common uses.
You use them in thermometers.
prevent goiter
Francium has not uses.