Decoding the mineral obsidian that once formed legendary ancient weapons.

From cooled lava flows, obsidian became a precious material that ancient people exploited to craft knives, spearheads, and some of the sharpest tools in history.

Obsidian is formed from rapidly cooling lava. The sudden cooling of the lava prevents the rock from crystallizing and gives it a glass-like surface. Photo: Pinterest.

Characteristic black color. Obsidian is usually black, but rainbow or snow-white variations can also occur. Photo: Pinterest.

Extremely sharp. Obsidian has a sharper edge than any other type of steel blade. Photo: Pinterest.

It is brittle when cut into pieces. This is why ancient people used this mineral to make arrowheads. Photo: Pinterest.

A "teardrop" shape may form. These round obsidian crystals are created by the wind when lava is ejected into the air. Photo: website-files.com.

Closely associated with Central American beliefs, obsidian was highly valued by the Aztec and Mayan cultures. Photo: Pinterest.

Used as mirrors. The Aztecs once crafted obsidian mirrors for divination purposes. Photo: Pinterest.

Used in modern surgery. Some microsurgical knives use obsidian as the cutting blade due to its high sharpness. Photo: Pinterest.

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