mineral

Pale blue-gray chalcedony (probable)

Microcrystalline quartz, SiO₂; possibly common chalcedony or quartz-rich volcanic rock

AI-generated identification · may be incorrect

Waxy to dull luster, translucent gray-blue color, irregular fracture, and no visible cleavage. Mohs hardness about 6.5–7; specific gravity about 2.6. The image does not resolve crystal texture well enough to distinguish chalcedony from altered volcanic material confidently.

Identified September 19, 2026More mineral →

Explore Pale blue-gray chalcedony (probable) 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

Chalcedony forms when silica-rich fluids fill cavities and fractures, commonly in volcanic rocks; it is generally Phanerozoic in age. Around 39.3°N, 48.5°E, volcanic and sedimentary rocks of the Lesser Caucasus region make silica-rich pebbles plausible.

Uses & applications

Used as an ornamental stone, cabochon material, lapidary rough, and occasionally aggregate; this small weathered fragment has little commercial value.

Geological facts

Blue-gray color can result from microscopic inclusions or scattering in extremely fine quartz. A steel file should not scratch it easily, while quartz can scratch glass.

Field identification & locations

Field identification: test hardness, inspect for waxy translucency, and look for conchoidal fracture; fizzing with dilute acid would indicate carbonate instead. Likely common as transported river or volcanic-field material in the region.