The white clay that becomes porcelain when fired, that coats every glossy magazine page (75 percent of mined kaolin goes to paper-coating, not ceramics), that fills every paint and rubber and plastic where a white inert filler is wanted. Kaolin is the canonical white clay — pure aluminum silicate, weathered out of feldspar over geological time, mined as kaolinite ore from beds in Cornwall (the historic source — the 'china clay' name comes from the village of Saint Austell in Cornwall, where the deposits supplied English Wedgwood and Spode porcelain), Georgia / South Carolina (the largest US deposits, supplying paper-coating), Brazil, China. The studio-potter formulations blend kaolin with feldspar (the flux) and silica (the glassy phase) and ball clay (the plastic binder) to make porcelain bodies. The industrial paper-coating use uses calcined kaolin (kaolin heated to 800-1000 °C to drive off chemically-bound water and shift particle morphology). Buy as raw mineral from ceramic-supply houses (Sheffield Pottery, Continental Clay, Standard Ceramic Supply); industrial paper-coating grades from Imerys / KaMin direct.
Hydrated aluminum silicate clay mineral, structural formula Al2Si2O5(OH)4, the dominant phase in china-clay deposits. Density 2600 kg/m³ (mineral density; loose powder ~600-1000 kg/m³). Particle morphology platelet / hexagonal flakes, equivalent spherical diameter 0.2-2 µm in the natural state. Mohs hardness 2-2.5 (very soft, the softness that makes kaolin work as a paper coating without abrading paper-machine wires). Refractive index 1.55-1.57. Brightness (paper-coating spec) 80-92 GE brightness for high-grade. pH neutral when wet. Plasticity moderate when wetted (less plastic than ball clay; high-plasticity ceramic bodies blend kaolin with ball clay to gain workability). Fires to white at all temperatures (from 1100 °C earthenware through 1450 °C high-fire porcelain). Calcined kaolin (heated to 800-1000 °C) loses chemically-bound water and converts to a different particle morphology useful as paper-coating filler and rubber filler. The porcelain formulation blends roughly 50 percent kaolin + 25 percent feldspar + 25 percent silica + minor ball clay for plasticity; this triaxial blend defines high-fire ceramic bodies worldwide.
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 #f4f0e8 metallic 0.00 roughness 0.75 ior 1.45 transmission 0.00 clearcoat 0.00 sheen 0.00 anisotropic 0.00
{
"albedo": "#f4f0e8",
"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
# Kaolin (China Clay, Porcelain Raw Material) · finish: matte
import bpy
mat = bpy.data.materials.new(name="mat_kaolin_china_clay")
mat.use_nodes = True
bsdf = mat.node_tree.nodes["Principled BSDF"]
bsdf.inputs["Base Color"].default_value = (0.9047, 0.8714, 0.807, 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
# Kaolin (China Clay, Porcelain Raw Material) · finish: matte
# Run from Window → Scripting Console
import lux
mat = lux.createMaterial(name="mat_kaolin_china_clay", materialType="Generic")
mat.setProperty("diffuse", (244, 240, 232)) # 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": "Kaolin (China Clay, Porcelain Raw Material) \u00b7 finish: matte",
"baseColor": {
"r": 0.9047,
"g": 0.8714,
"b": 0.807
},
"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_kaolin_china_clay",
"pbrMetallicRoughness": {
"baseColorFactor": [
0.9047,
0.8714,
0.807,
1.0
],
"metallicFactor": 0.0,
"roughnessFactor": 0.75
},
"extensions": {
"KHR_materials_ior": {
"ior": 1.45
}
}
}
]
}# USD Preview Surface — UsdShade.MaterialLook prim attributes
# Kaolin (China Clay, Porcelain Raw Material) · finish: matte
def Material "mat_kaolin_china_clay" {
token outputs:surface.connect = </mat_kaolin_china_clay/PreviewSurface.outputs:surface>
def Shader "PreviewSurface" {
uniform token info:id = "UsdPreviewSurface"
color3f inputs:diffuseColor = (0.9047, 0.8714, 0.807)
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
}
}
ASTM C242 ceramic terminology; Imerys kaolin technical literature.
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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