mineral

Greenish chert or serpentine-rich rock

Likely microcrystalline quartz (SiO₂), possibly with chlorite/serpentine inclusions

AI-generated identification · may be incorrect

Olive-green, opaque to slightly translucent, dull to waxy luster, irregular conchoidal-looking fracture; estimated Mohs hardness 6–7 if chert, or 2.5–5.5 if serpentine-rich. No visible crystals or cleavage.

Identified September 16, 2026More mineral →

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Physical properties

Formation & geological history

Most consistent with silicification of sediment or alteration of ultramafic rock; exact age and identity cannot be established from the photograph alone. Commonly forms in hydrothermal, oceanic, or metamorphic environments.

Uses & applications

Chert is used as a toolstone, aggregate, and lapidary material; serpentine-rich pieces are mainly ornamental or collectible. This small rough fragment has little commercial value.

Geological facts

The green color may come from iron, chlorite, epidote, or serpentine rather than the primary mineral itself. A hardness test and streak, translucency, and acid testing would substantially improve identification.

Field identification & locations

Commonly encountered in serpentinite zones, altered volcanic terrains, and gravel deposits. Test with a steel knife, glass, and unglazed porcelain; avoid assuming jade without confirming hardness, density, and composition.