mineral

Pale green rough mineral specimen, likely serpentine or calcite

Probable serpentine-group mineral, Mg₃Si₂O₅(OH)₄; possibly pale-green calcite, CaCO₃

AI-generated identification · may be incorrect

Light green, dull to waxy luster, massive and irregular with no obvious crystals; estimated Mohs hardness 2.5–4. Serpentine is typically waxy and scratches glass poorly; calcite shows three-way cleavage and fizzes with dilute hydrochloric acid.

Identified August 9, 2026More mineral →

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Physical properties

Formation & geological history

Serpentine forms when ultramafic rocks undergo hydration and alteration, commonly in ancient oceanic crust and subduction zones; calcite forms from carbonate-rich fluids or sedimentary deposits. Age cannot be determined from the image.

Uses & applications

Serpentine is used as an ornamental and carving stone; calcite is used in cement, lime, construction aggregate, and optical specimens. This rough piece has limited commercial value unless testing confirms a desirable variety.

Geological facts

The color and lumpy texture are consistent with serpentine, but lighting and surface weathering prevent confident identification. Serpentine may contain associated magnetite or chromite in altered ultramafic rocks.

Field identification & locations

Common sources include California, Italy, New Zealand, Canada, and many ophiolite belts; calcite is globally widespread. Test hardness, streak, acid reaction, and specific gravity for identification.