igneous
Greenish weathered volcanic rock, likely altered basalt
Altered basalt/mafic volcanic rock; green coloration may reflect chlorite, epidote, or celadonite
AI-generated identification · may be incorrectFine-grained, dull earthy luster, olive-green weathered surface with pinkish-brown iron-oxide rind. Likely hardness about 5–6, massive texture, no obvious cleavage or visible crystals; exact mineralogy requires testing.
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Physical properties
Fine-grained, dull earthy luster, olive-green weathered surface with pinkish-brown iron-oxide rind. Likely hardness about 5–6, massive texture, no obvious cleavage or visible crystals; exact mineralogy requires testing.
Formation & geological history
Probably formed as basaltic lava, then altered by low-temperature hydrothermal or groundwater processes and later weathered. Basalt is commonly Cenozoic or older; the specimen’s precise age cannot be determined visually.
Uses & applications
Ordinary basalt is used for aggregate, road metal, and construction stone. This rough piece has little commercial value unless analysis reveals attractive zeolite, epidote, or other mineral filling.
Geological facts
The green color is not sufficient to identify jade; true jade is tougher, waxier, and usually more homogeneous. A streak, hardness, density, and thin-section/XRF test would improve identification.
Field identification & locations
Plausible near 11.9°N, 79.8°E, where weathered mafic rocks and lateritic material can occur, though local geology should be checked. Look for vesicles, dark fine grains, and green alteration minerals; it should not fizz strongly with dilute acid.
