Results for: Obsidian

In Geology

What are the uses of obsidian?

The properties of obsidian made it a valuable commodity for stone age tool makers, as a blade could be fashioned with a sharpness finer than that of any steel, down to nearly (MORE)
In Geology

What are facts about obsidian?

Obsidian is a mineral we sometimes call volcanic glass, and like "regular" glass, it is composed of mostly silicon dioxide (SiO 2 ). Some oxides of magnesium and iron are usua (MORE)
In Geology

What is obsidian?

It is a usually black or banded, hard volcanic glass that displaysshiny, curved surfaces when fractured and is formed by very rapidcooling of lava. The curved fracture surfa (MORE)
In Geology

Is obsidian poisonous?

No. But ingesting fractured obsidian could be harmful to the digestive system. If in doubt, contact a medical professional.
In Geology

What is the obsidian use for?

It has been used to craft tools, historically. Obsidian has also been used to make jewelry.
In Science

Does obsidian have cavities?

It is a rarity but some Obsidian has been found with small Gas Bubbles in it which when chipped or broken it can have cavities. the Natural Museum in San Francisco, California (MORE)