igneous
Weathered iron-rich rock, possibly oxidized basalt or laterite
Indeterminate; likely iron-oxide-bearing mafic rock (basaltic composition)
AI-generated identification · may be incorrectBrown to dark green, rusty, dull-to-earthy luster, fine-grained and heavily weathered; likely Mohs hardness about 5–6, with no visible cleavage and modest specific gravity around 2.7–3.3.
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Physical properties
Brown to dark green, rusty, dull-to-earthy luster, fine-grained and heavily weathered; likely Mohs hardness about 5–6, with no visible cleavage and modest specific gravity around 2.7–3.3.
Formation & geological history
Likely formed as volcanic basalt and later altered by oxidation and weathering, producing iron oxides/hydroxides; exact age and process cannot be established from the photograph.
Uses & applications
Usually a common field specimen with little commercial value; iron-rich material may be studied as an ore or used decoratively, but this piece is not visibly gem quality.
Geological facts
Rust-brown coloration commonly comes from hematite, goethite, or limonite coating or replacing original minerals. The green tones may reflect chlorite, epidote, or other alteration minerals.
Field identification & locations
Look for a dense, nonlayered texture, dark mafic fragments, and reddish-brown streaks; a streak test, magnet test, hardness test, and fresh broken surface would improve identification. Common in weathered volcanic terrains worldwide.
