tektite

Moldavite

Moldavite (Silica-rich glass, SiO2 + Al2O3)

AI-generated identification · may be incorrect

Hardness: 5.5-7 (Mohs); Color: Forest green, olive green, or pale green; Luster: Vitreous; Crystal Structure: Amorphous (glassy); Specific Gravity: 2.27-2.40

Hardness: 5
Color: Forest green, olive green, or pale green
Luster: Vitreous

Identified July 12, 2026More tektite →

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Physical properties

Hardness: 5.5-7 (Mohs); Color: Forest green, olive green, or pale green; Luster: Vitreous; Crystal Structure: Amorphous (glassy); Specific Gravity: 2.27-2.40

Formation & geological history

Formed approximately 15 million years ago by the impact of a meteorite in southern Germany (Ries crater), which melted terrestrial rock and ejected it into the atmosphere, where it cooled and fell back over the Czech Republic.

Uses & applications

Primarily used in jewelry, as cabochons or faceted stones, and as a highly sought-after specimen for mineral and gemstone collectors.

Geological facts

Moldavite is an extraterrestrial-related material known as a tektite. It is unique among tektites for its vibrant green color and transparency. It was once used in the Stone Age for making tools and amulets.

Field identification & locations

Identify by its characteristic 'lechatelierite' (melted quartz) inclusions and bubbles under magnification. Authentic pieces often have a wrinkled or sculpted surface. Commonly found in the Czech Republic, specifically the Bohemian plateau.