sedimentary
Soil aggregate / Caliche nodule
Pedogenic carbonate / Indurated soil nodule
AI-generated identification · may be incorrectHardness 1.5–3 Mohs; earthy to dull luster; brown to tan with yellowish-white patches; porous and crumbly texture.
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Physical properties
Hardness 1.5–3 Mohs; earthy to dull luster; brown to tan with yellowish-white patches; porous and crumbly texture.
Formation & geological history
Formed via pedogenic precipitation of carbonates, clays, and oxides in arid to semi-arid soil horizons during recent geological epochs.
Uses & applications
Primarily analyzed for agricultural soil quality, paleoclimate studies, and geotechnical stability assessments.
Geological facts
Pedogenic nodules preserve isotopic records of past rainfall, temperature, and vegetation cover.
Field identification & locations
Identified by its rough, earthy texture, crumbly nature, and effervescence in dilute acid; found globally in arid and weathered soil profiles.
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