sedimentary
Soil Clod / Caliche Nodules
Pedogenic Calcrete / Clay aggregate
AI-generated identification · may be incorrectHardness 1-3 Mohs, dull/earthy luster, amorphous texture, variable brown to tan color, highly friable.
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Physical properties
Hardness 1-3 Mohs, dull/earthy luster, amorphous texture, variable brown to tan color, highly friable.
Formation & geological history
Formed by weathering, accumulation of soil organic matter, silt, clay, and precipitated calcium carbonate in arid to semi-arid settings.
Uses & applications
Agricultural substrate; nodules have no industrial use, though bulk caliche can be used as road base.
Geological facts
Commonly forms in B and C soil horizons when soluble salts evaporate and bind loose particles together.
Field identification & locations
Identify by earthy odor when damp, low density, and tendency to crumble easily under pressure.
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