A rough, evenly textured stone surface produced by repeated impact with a bush hammer or bocciarda.
Bocciardato describes a surface that has undergone bocciardatura, a texturing process in which repeated impacts create a uniformly roughened surface. Traditionally this was done with a hand-held bocciarda; larger surfaces are now commonly processed mechanically.
The resulting texture increases visual diffusion and can improve slip resistance, making the finish common on exterior paving, steps, and architectural stone.
Etymology
Past participle of Italian bocciardare, from bocciarda, the toothed hammer used to texture stone.
Sculptor Notes
Bocciardato describes the resulting finish; bocciardatura is the process. The scale and density of the tool points strongly affect the final texture.
References
https://www.treccani.it/vocabolario/bocciardatura/ | https://www.treccani.it/vocabolario/bocciardare/