mineral

Greenish quartz (likely prase/chalcedony)

Quartz, SiO₂; possibly green chalcedony or chlorite-included quartz

AI-generated identification · may be incorrect

Translucent blue-green to gray-green, vitreous-to-waxy luster, conchoidal fracture, and no obvious cleavage; Mohs hardness 7, specific gravity about 2.65. The rough brown coating may be weathered host rock or iron staining.

Identified August 15, 2026More mineral →

Explore Greenish quartz (likely prase/chalcedony) in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Likely hydrothermal quartz formed in fractures of the Tatra Mountains, commonly during Alpine-related mineralization; exact age depends on locality and host rock. The green color may come from chlorite, actinolite, or other inclusions.

Uses & applications

Mostly a collector specimen; attractive translucent material may be cut or polished as ornamental stone, though this piece appears fractured and low-grade for jewelry.

Geological facts

The Tatra region contains abundant granite, metamorphic rocks, quartz veins, and alpine fissure minerals. Color alone cannot reliably distinguish green quartz from green chalcedony or altered glass.

Field identification & locations

The specimen is visibly geological, but identification is provisional from one photograph. Test for glass-like conchoidal fracture and scratch resistance; quartz should scratch ordinary glass, while a magnet and acid test are generally unhelpful.