Obsidian is a natural volcanic glass: it is a kind of igneous rock. It is produced when lava high in silica (SiO2) cools rapidly, and solidifies quickly. Because there is no crystal structure, obsidian blade edges can reach almost molecular thinness. They were used as arrowheads, and today they may be used as surgical scalpel blades.
Obsidian
Questions and Answers
Q: What is obsidian?
A: Obsidian is a natural volcanic glass and a type of igneous rock.
Q: How is obsidian formed?
A: Obsidian is formed when lava high in silica cools rapidly and solidifies quickly.
Q: What is the unique feature of obsidian blade edges?
A: Obsidian blade edges can reach almost molecular thinness due to the lack of crystal structure.
Q: How were obsidian blades used in the past?
A: Obsidian blades were used as arrowheads in the past.
Q: What is the modern-day use of obsidian blades?
A: Obsidian blades may be used as surgical scalpel blades today.
Q: What is the main component of obsidian lava?
A: The main component of obsidian lava is silica, or SiO2.
Q: Is there a crystal structure in obsidian?
A: No, there is no crystal structure in obsidian.