Tag:material=tufa

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Public-images-osm logo.svg material = tufa
Absalons Arch Roskilde 2015-03-30-4779.jpg
Description
A soft sedimentary rock, similar to limestone, formed in fresh water, springs, rivers, especially in  karst around waterfalls
Group: properties
Used on these elements
may be used on nodesmay be used on waysmay be used on areas (and multipolygon relations)should not be used on relations (except multipolygon relations)
Status: in use

The gothic arch built of tufa / travertine

 Tufa (and/or  travertine) is a soft sedimentary rock, similar to limestone, formed by the chemical precipitation of calcium carbonate minerals from fresh water, typically in springs, rivers, and lakes, especially in  karst around waterfalls.

Tufa is a building:material=* or a roof:material=* composed of a soft sedimentary rock.