Rock Identifier
Weathered greenish rock fragment (Tentatively altered basalt or serpentinite; exact identification requires testing) — igneous
igneous

Weathered greenish rock fragment

Tentatively altered basalt or serpentinite; exact identification requires testing

AI-generated identification · may be incorrect

Fine- to medium-grained, olive-green to brown, dull earthy luster, irregular fracture, and no visible crystal cleavage. Likely Mohs hardness about 3–6, but the photograph is insufficient for reliable measurement.

Identified More igneous
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Physical properties

Fine- to medium-grained, olive-green to brown, dull earthy luster, irregular fracture, and no visible crystal cleavage. Likely Mohs hardness about 3–6, but the photograph is insufficient for reliable measurement.

Formation & geological history

Possibly a weathered mafic volcanic rock or serpentinized ultramafic rock formed through cooling of magma or hydrothermal alteration; age and formation locality cannot be determined visually.

Uses & applications

Unlikely to have commercial value as an isolated fragment; comparable rocks are used as aggregate, dimension stone, or decorative material when sound and attractive.

Geological facts

The prominent dark seam may be a fracture filled with iron oxides, clay, or a darker mineral. Green coloration commonly reflects chlorite, epidote, olivine alteration, or serpentine.

Field identification & locations

Test streak, hardness, density, and magnetism; a glassy scratch test, acid reaction, or diagnostic crystal texture would help distinguish basalt from serpentinite. Common possibilities occur in volcanic belts and tectonic ophiolites worldwide.