igneous
Green Sheen Obsidian
Volcanic Glass (SiO2 with microscopic inclusions)
Hardness: 5-5.6 on the Mohs scale, Color: Greenish with golden or silvery chatoyant sheen, Luster: Vitreous (glassy), Crystal Structure: Amorphous (non-crystalline), Cleavage: Conchoidal, Specific Gravity: 2.35-2.60
- Hardness
- 5-5
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Physical properties
Hardness: 5-5.6 on the Mohs scale, Color: Greenish with golden or silvery chatoyant sheen, Luster: Vitreous (glassy), Crystal Structure: Amorphous (non-crystalline), Cleavage: Conchoidal, Specific Gravity: 2.35-2.60
Formation & geological history
Formed from felsic lava extruded from volcanoes where rapid cooling prevents crystal growth, trapping microscopic gas bubbles or mineral crystals that create the characteristic sheen.
Uses & applications
Used primarily in lapidary arts, carved into cabochons, pendants, and beads for jewelry, and collected by mineral enthusiasts.
Geological facts
Green sheen obsidian is a less common variety of obsidian, highly valued for the optical illusion of depth and movement created by light reflecting off microscopic structures within the volcanic glass.
Field identification & locations
Identified by its vitreous luster, conchoidal fracture, and distinctive green metallic sheen under direct lighting. Found in volcanic regions globally, particularly Mexico and the USA.
