igneous
Weathered greenish stone, possibly serpentinite or altered basalt
Tentatively serpentinite (mostly serpentine minerals) or chlorite-rich basalt; exact identification requires testing
AI-generated identification · may be incorrectDark green-gray, fine-grained, dull to weakly waxy luster, rounded by abrasion, with rusty-brown weathering patches. Likely Mohs hardness about 3–6 depending on composition; no visible crystals or cleavage.
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Physical properties
Dark green-gray, fine-grained, dull to weakly waxy luster, rounded by abrasion, with rusty-brown weathering patches. Likely Mohs hardness about 3–6 depending on composition; no visible crystals or cleavage.
Formation & geological history
Could represent metamorphosed ultramafic rock (serpentinite) formed by hydration of mantle peridotite, or weathered volcanic basalt; ages vary widely from Precambrian to recent geological settings.
Uses & applications
Common serpentinite is used as decorative stone, carving material, and aggregate; basalt is widely used for construction aggregate and paving. This small rounded specimen has little commercial value.
Geological facts
Green color commonly reflects serpentine, chlorite, epidote, or iron-bearing alteration minerals. The image alone cannot reliably distinguish serpentinite from basalt or other green metamorphic rocks.
Field identification & locations
Look for a distinctly waxy feel, low hardness, and possible fibrous texture for serpentinite; basalt is typically harder and may show tiny feldspar crystals. Common sources include ophiolite belts, volcanic terrains, and stream gravels.
