Tufa is the name for an unusual geological formation.
Tufa is a rough, thick, rock-like calcium carbonate deposit that forms by precipitation from bodies of water with a high dissolved calcium content. Tufa deposition occurs in six known ways:
Mechanical precipitation by wave action against the shore. This form of tufa can be useful for identifying the shoreline of extinct lakes (for example in the Lake Lahontan region).
Precipitation from supersaturated hot spring water entering cooler lake water.
Precipitation in lake bottom sediments which are fed by hot springs from below.
Precipitation from calcium-bearing spring water in an alkaline lake rich in carbonates.
Precipitation throughout the lake as the lake dries out.
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Tufas and travertines are formed in fluvial environments with a growth rate that can sometimes exceed 0.8 in (2 cm) per year but is seldom smaller than 0.08 in (2 mm) per year.
Tufa is a rough, thick, rock-like calcium carbonate deposit that forms by precipitation from bodies of water with a high dissolved calcium content.
Usage note: The rock type "tufa" is commonly confused in name by laypersons with the rock type "tuff", which is a rock formed from welded volcanic ash.
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