Collector’s Piece: Natural Glass var. Obsidian from Caldas, Columbia

Collector’s Piece: Natural Glass var. Obsidian from Caldas, Columbia

Dimension: 10.8cm x 7.8cm x 5.4cm

Weight: 484g

Locality: Department of Caldas, Columbia


A lab CERTIFIED, rare bi-color Natural Glass var. Obsidian mined in the volcanic district of the Department of Caldas in Columbia.  This beautiful large cabinet Obsidian has seeming natural conchoidal fracture and vitreous luster.  The specimen exhibits an eye-catching blue and green colors and air bubble inclusions.  It is completely transparent, way more beautiful in person!  Comes with a high quality copper-wired display stand and a certificate of authenticity as pictured. 


I’d been lucky to have acquired one lot of these gorgeous natural glasses back in 2019, it came in different colors and transparency but only a few display striking bi-color like this piece.  Every single piece has been sent to the mineral testing center of the PR China Land & Resources Ministry to certify for its authenticity so they are guaranteed to be 100% natural.


Obsidian and is formed by rapid colling of viscous lava from volcanoes.  These amorphous volcanic glasses are usually black to grey-black in colors.  It also occurs as red, brown-green, green, yellow, orange, and rare transparent colorless.  The transparency is commonly opaque but some are found completely transparent.   Air bubbles are sometimes imparted in the course of magma flow.