Stone surface worked with rotating diamond-bristle brushes — material removes from the soft mineral phases first, leaving a low-relief texture that reads as soft and supple under the hand. The intermediate option between honed and polished: matte sheen with subtle tactile relief. Industry name 'leathered' refers to the surface character, not the material. Increasingly popular on dark-granite kitchen countertops since the early 2010s.
Diamond-impregnated nylon brushes rotate against the slab, preferentially abrading softer mineral phases (feldspar, mica) faster than harder (quartz, rutile). Surface develops 100–500 µm low-relief texture along the natural mineral structure. Color reads slightly darker than polished (less specular wash-out, more visible chroma at depth). Slip-coefficient between honed and flamed — better than polished, less aggressive than flamed. Common on absolute-black, jet-mist, ubatuba, and other dark granites where this finish reads premium.
character — soft tactile relief, satin-matte sheen, dark chroma reads through, premium-modern register.
Marble Institute of America / Natural Stone Institute care-and-finish guides; ASTM C1242 dimension stone terminology.
House vocabulary — terms ForMatter uses with intent.
Materials and processes for people who design and make things.
A local-first library of materials, processes, applications, and finishes — equal weight, citable everywhere, so a student can move from "what is this" toward "what's actually buildable here, now, by me." Part of the renato.design ecosystem — sibling of Plenum, Specimen, Ingenue, gesture, graf, and the Renato Rhino plug-ins. Form and matter, inseparable.
Half of teaching materials is teaching how the material is made into the thing. The standard subscription library was always light on that half. The wedge here isn't better samples or a prettier interface — it's treating Process as a peer entity, not a footnote.
Conway, Lefteri, Forty, Sparke, ASM, GIA. Every voice: Voices.
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