igneous
Reddish weathered rock, likely iron-rich basalt or jasper
Probable basalt (mafic silicate rock) with hematite/goethite staining; exact identification requires testing
AI-generated identification · may be incorrectDark reddish-brown, dull to slightly earthy luster, fine-grained and massive, with no visible crystals or cleavage; likely Mohs hardness about 5–6 and specific gravity roughly 2.8–3.2. The red color is consistent with iron-oxide alteration.
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Physical properties
Dark reddish-brown, dull to slightly earthy luster, fine-grained and massive, with no visible crystals or cleavage; likely Mohs hardness about 5–6 and specific gravity roughly 2.8–3.2. The red color is consistent with iron-oxide alteration.
Formation & geological history
If basalt, it formed from rapidly cooled mafic lava, commonly in volcanic flows, generally younger than ~2.5 billion years; surface weathering oxidized iron-bearing minerals. The photograph alone cannot establish geological age.
Uses & applications
Common basalt is used as aggregate, roadstone, riprap, and dimension stone; attractive polished pieces may be collected decoratively. This small, unverified specimen has minimal commercial value.
Geological facts
Basalt commonly contains plagioclase and pyroxene, while hematite and goethite produce red, brown, or orange weathering colors. It may resemble red jasper, ironstone, or altered volcanic rock.
Field identification & locations
Look for a fine-grained texture, weak attraction to a magnet if magnetite is present, and no reaction to dilute acid; a streak, hardness, density, and thin-section test would distinguish basalt from jasper or ironstone. Common worldwide in volcanic regions.
