Agate pebbles

Agate pebbles

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Caption: Agate pebbles on sand. The banded layers are chalcedony (non-crystalline silica). Enough light penetrates the agate to support the growth of lichen colonies on the underside of the stones. (Partly visible, on right stone at upper right). Photographed in Namibia, Africa.

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Keywords: africa, african, agate, alga, amorphous, banded, biological, biology, botanical, botany, chalcedony, chip, chips, duo, earth science, fungus, geology, lichen, lichens, light penetration, microbiological, microbiology, mineral, mutualism, namibia, nature, non-crystalline, pair, pebble, pebbles, photosynthesis, plant, quartz, silica, silicon dioxide, stone, stones, symbiosis, symbiotic, translucent, two, underside, undersides, wind-polished

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