igneous
Iron-rich basalt or hematitic volcanic rock
Basalt, likely Fe-oxide-bearing; exact identification requires testing
AI-generated identification · may be incorrectDark reddish-brown, dull to slightly earthy luster, fine-grained and irregular; likely hardness about 5–6 Mohs, with no obvious cleavage. The orange glow appears to come from surrounding lighting or a container, not the specimen itself.
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Physical properties
Dark reddish-brown, dull to slightly earthy luster, fine-grained and irregular; likely hardness about 5–6 Mohs, with no obvious cleavage. The orange glow appears to come from surrounding lighting or a container, not the specimen itself.
Formation & geological history
Probably a volcanic rock formed when mafic lava cooled rapidly at or near Earth’s surface; iron minerals may have oxidized during later weathering. Its geological age cannot be determined from the image.
Uses & applications
Common basalt is used as crushed aggregate, road stone, concrete component, and occasionally building stone; small pieces have modest collecting interest.
Geological facts
Basalt commonly contains plagioclase, pyroxene, and sometimes olivine, with red coloration caused by iron oxides. The image alone cannot reliably distinguish basalt from weathered scoria, ironstone, or slag.
Field identification & locations
Look for a dense fine-grained texture, black-to-gray fresh surfaces, magnetic response, and possible tiny feldspar crystals; a streak, magnet, density, and thin-section test would help. Common worldwide, especially volcanic regions and oceanic crust.
