mineral

Possible tektite or dark volcanic rock fragment

Uncertain; likely natural silicate glass (tektite) or basalt

AI-generated identification · may be incorrect

Small, dark gray-black, irregular fragment with a dull to slightly glassy luster; apparent hardness about 5–7 Mohs, with no visible crystal faces or cleavage. The image is too blurred for reliable mineral identification.

Identified August 12, 2026More mineral →

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Physical properties

Formation & geological history

If a tektite, it formed when a meteorite impact melted terrestrial sediments and ejected rapidly cooled glass, commonly within the last several million years. If basalt, it crystallized from mafic lava, typically at or near Earth’s surface.

Uses & applications

Tektites are primarily collector specimens; basalt is widely used as crushed aggregate, paving stone, and building material. Value depends strongly on confirmed identity, provenance, and surface quality.

Geological facts

Tektites often show aerodynamic shapes, flow textures, and bubble-like pits; basalt usually displays a fine-grained crystalline texture and may contain tiny vesicles.

Field identification & locations

Confirm with a sharp photograph, streak, specific gravity, and ideally microscopy or Raman/XRF testing; common tektites include moldavites and Australasian tektites, while basalt is widespread worldwide.