sedimentary
Expanded Clay Pebble
Lightweight Expanded Clay Aggregate (LECA)
AI-generated identification · may be incorrectHardness: 3-5 (Mohs), Color: Brown to reddish-brown, Luster: Dull/Earthy, Structure: Vesicular/Porous internal structure with a hard outer shell, Specific Gravity: 0.3-0.7 (often floats)
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Physical properties
Hardness: 3-5 (Mohs), Color: Brown to reddish-brown, Luster: Dull/Earthy, Structure: Vesicular/Porous internal structure with a hard outer shell, Specific Gravity: 0.3-0.7 (often floats)
Formation & geological history
Formed by heating common clay to approximately 1200 degrees Celsius in a rotary kiln. The gases expand the clay into thousands of small bubbles, creating a honeycomb structure.
Uses & applications
Extensively used in hydroponics and aquaponics as a growing medium. Also used in construction for lightweight concrete, insulation, and water filtration systems.
Geological facts
It is one of the most popular hydroponic substrates because it provides excellent aeration and drainage while remaining chemically neutral and pH stable.
Field identification & locations
Identify by its spherical shape, lightweight feel, and porous interior. It is most commonly found in garden centers, construction sites using lightweight fill, or hydroponic setups.
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