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Obsidian

Obsidian

Release time:26 August 2019
Obsidian

Type
Rock

Chemical Formula
Non-uniform mixture 70–75% SiO2, with MgO, Fe3O4

Streak
White

Mohs Hardness
5

Color
Usually Black, but highly variable

Luster
Vitreous

Fracture
conchoidal

Description

Obsidian is black volcanic glass. It forms from super-cooled lava. It has been used for some of the earliest tools of humankind.

Uses

Obsidian is currently used for ornamental purposes, and researchers are investigating the use of obsidian for surgical scalpels in the medical industry.

Related cases

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