Obsidian can be used to make extremely sharp knives, and obsidian blades are a type of glass knife made using naturally occurring obsidian instead of manufactured glass.

Dec 9, 2025 · Obsidian, a natural glass of volcanic origin, is formed by the rapid cooling of viscous lava.

Obsidian is an igneous rock, a volcanic glass used for thousands of years to make cutting tools.

Jan 12, 2024 · Obsidian is a naturally occurring volcanic glass and one of the most striking types of igneous rocks. This article delves into what obsidian is, its formation and composition, the …

Obsidian is an extrusive rock that erupted out of a volcano. Most volcanic rocks are rough and jagged because they contain gas bubbles. But obsidian is smooth because it contains mostly …

Obsidian is a naturally occurring volcanic glass formed from the rapid cooling of molten rock. This swift solidification prevents mineral crystals from developing, creating a material with distinct …

Obsidian What is Obsidian Obsidian is both a Markdown editor and a knowledge base app. Used in the most basic way, you can edit and preview Markdown files. But its true power lies in …

Jun 17, 2025 · What Is Obsidian? Obsidian is a naturally occurring volcanic glass formed when lava cools rapidly, preventing crystal growth. The result? A smooth, shiny rock that fractures …

Nov 1, 2025 · obsidian (usually uncountable, plural obsidians) (mineralogy) A type of naturally occurring black glass produced by volcanoes. synonym quotations Synonym: obby

Obsidian is an igneous rock with a glassy form that is produced during the rapid cooling of volcanic lava. It is sometimes classified as a mineraloid, implying that it is mineral -like but not …