The dark gray-to-black volcanic stone that makes up the seafloor, the Hawaiian islands, the Columbia River basalt flows the Cascades sit on top of, the Roman roads, the modern paver. Basalt cools fast at the Earth's surface (vs. granite cooling slow at depth), so its grains stay too small to see — you read basalt as a single uniform dark mass. Where lava cooled with gas bubbles trapped, you get vesicular basalt, the holey volcanic rock used in lightweight aggregate. Where the cooling was slow enough to crack into hexagonal columns, you get the Giant's Causeway / Devil's Tower formations. The modern uses are paving (basalt pavers in European squares; Belgian-block sets), structural aggregate, fiber (basalt fiber for composites — a glass-fiber alternative drawn from melted basalt rod), and the increasingly common architectural cladding via Antolini / Stone Source. Buy as paving from quarry direct; as architectural slab from the Italian and German trade.
Igneous extrusive rock, fine-grained mafic composition (45–52 percent SiO2, the rest dominated by FeO, MgO, CaO). Mineralogy: plagioclase feldspar + clinopyroxene (augite) + olivine + magnetite, with grains too small (~0.1 mm) to identify in hand specimen. Density 2800–3000 kg/m³ (denser than granite — basalt is heavier than its color suggests). Compressive strength 200–400 MPa (very strong; rivals granite). Mohs hardness 5–6. Water absorption < 0.5 percent. Vesicular grades have lower density and strength (200–500 kg/m³ for scoria, 60–100 MPa compressive). Basalt fiber is drawn from melted basalt at ~1400 °C through platinum-rhodium bushings, yielding continuous filaments 9–25 µm in diameter with tensile strength 2700–3300 MPa — a glass-fiber alternative used in structural composites where alkali resistance and sustained-load fatigue matter. Basalt rebar is a corrosion-immune alternative to steel rebar in concrete (basalt fiber + epoxy / vinyl ester binder). Cuts with wet diamond saw; the hardness makes carving slow; takes a high polish on dense grades.
Kuma, in his work, challenges us to look at stone in a way that is truer to its new life as a wall component.
Principled BSDF defaults derived from the sphere matte finish. Reasonable seed for Blender, Substance, Keyshot, Rhino — tune per material. Or grab the whole library at once: ForMaterials library →
# finish: matte albedo #2a2a30 metallic 0.00 roughness 0.75 ior 1.45 transmission 0.00 clearcoat 0.00 sheen 0.00 anisotropic 0.00
{
"albedo": "#2a2a30",
"metallic": 0.0,
"roughness": 0.75,
"ior": 1.45,
"transmission": 0.0,
"clearcoat": 0.0,
"sheen": 0.0,
"anisotropic": 0.0
}
# Blender 4.x — Principled BSDF
# Basalt · finish: matte
import bpy
mat = bpy.data.materials.new(name="mat_basalt")
mat.use_nodes = True
bsdf = mat.node_tree.nodes["Principled BSDF"]
bsdf.inputs["Base Color"].default_value = (0.0232, 0.0232, 0.0296, 1.0)
bsdf.inputs["Metallic"].default_value = 0.000
bsdf.inputs["Roughness"].default_value = 0.750
bsdf.inputs["IOR"].default_value = 1.450
bsdf.inputs["Transmission Weight"].default_value = 0.000
bsdf.inputs["Coat Weight"].default_value = 0.000
bsdf.inputs["Sheen Weight"].default_value = 0.000
bsdf.inputs["Anisotropic"].default_value = 0.000
# KeyShot 11+ — lux Python API, Generic material
# Basalt · finish: matte
# Run from Window → Scripting Console
import lux
mat = lux.createMaterial(name="mat_basalt", materialType="Generic")
mat.setProperty("diffuse", (42, 42, 48)) # 8-bit sRGB
mat.setProperty("metallic", 0.000)
mat.setProperty("roughness", 0.750)
mat.setProperty("indexOfRefraction", 1.450)
mat.setProperty("transparency", 0.000)
mat.setProperty("coatingWeight", 0.000)
{
"_format": "Substance Designer / Painter \u2014 pbrMetalRough constants",
"_about": "Basalt \u00b7 finish: matte",
"baseColor": {
"r": 0.0232,
"g": 0.0232,
"b": 0.0296
},
"metallic": 0.0,
"roughness": 0.75,
"ior": 1.45,
"opacity": 1.0,
"anisotropyLevel": 0.0,
"_notes": "Channels listed are the standard Substance pbrMetalRough output. Drop into a Uniform Color node per channel, or as the constant input on a layered stack."
}{
"asset": {
"version": "2.0",
"generator": "ForMatter"
},
"materials": [
{
"name": "mat_basalt",
"pbrMetallicRoughness": {
"baseColorFactor": [
0.0232,
0.0232,
0.0296,
1.0
],
"metallicFactor": 0.0,
"roughnessFactor": 0.75
},
"extensions": {
"KHR_materials_ior": {
"ior": 1.45
}
}
}
]
}# USD Preview Surface — UsdShade.MaterialLook prim attributes
# Basalt · finish: matte
def Material "mat_basalt" {
token outputs:surface.connect = </mat_basalt/PreviewSurface.outputs:surface>
def Shader "PreviewSurface" {
uniform token info:id = "UsdPreviewSurface"
color3f inputs:diffuseColor = (0.0232, 0.0232, 0.0296)
float inputs:metallic = 0.000
float inputs:roughness = 0.750
float inputs:ior = 1.450
float inputs:opacity = 1.000
float inputs:clearcoat = 0.000
token outputs:surface
}
}
ICOMOS-ISCS stone-deterioration glossary; Schröpfer *Material Design* on basalt architectural use.
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, with cost-over-volume curves, trade-off profiles, equipment-tier filters, and second-life paths layered onto the data 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's Material World on raw materials, Lefteri's Making It on processes, Forty's Concrete and Culture, Sparke's Design in Context, Bürdek's Design: History, Theory and Practice of Product Design, Schröpfer's Material Design on materials in architecture, Winchester's The Perfectionists on tolerance, Minshall's Your Life Is Manufactured on the global supply chain, von Busch's Making Trouble on material activism, Were's How Materials Matter, Hegger / Drexler / Zeumer's Basics Materials, Untracht and McCreight on metalsmithing, USDA Forest Products Lab on woods, GIA on gemstones, Schott / CoorsTek / Toray / Owens Corning datasheets, MakeItFrom for verifiable property numbers, ASM Handbook, ISO standards. Museum holdings draw from the Met, MAD, V&A, Smithsonian American Art Museum, Newark Museum of Art, British Museum, Heard Museum, Smithsonian NMAI, Eiteljorg Museum, Philadelphia Museum of Art, Cranbrook Art Museum, and Grand Rapids Art Museum — collection-record permalinks only, designer overview pages and exhibition listings excluded. Voice blocks now ride on every entry kind — material, process, application, and finish — and include Ruskin on iron, Anni Albers on twining, Greg Lynn on the shred-and-teeth NURBS lineage, Pugin on the metal that won't be hammered, Barthes / Yanagi / Benjamin channeled within their philosophy; Sparke, Bürdek, Forty, Conway, Schröpfer, Minshall, von Busch, Lefteri, Pat Pruitt, Mary Lee Hu, Tom Joyce, Albert Paley, and the rest of the contemporary makers quoted verbatim with citation. All cited.
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