Potters group clay bodies into three broad families. They are distinguished mainly by firing temperature and by how dense — how vitrified — the fired body becomes. Vitrification is the point at which the clay particles fuse toward a glass-like, non-porous state; the higher the maturing temperature, generally the denser and less porous the result.

Earthenware — the low-fire family

Earthenware matures at the lowest temperatures, in the low-fire range (roughly cone 08 to cone 3 on the Orton scale). Because it is fired cooler, the body stays relatively porous and is not fully vitrified, so unglazed earthenware will absorb water and earthenware must be glazed to hold liquids reliably. It is softer and more prone to chipping than the higher-fired bodies, but it is forgiving to work, widely available, and the terracotta most people picture is earthenware. It is a friendly first clay.

Stoneware — the studio workhorse

Stoneware matures higher, typically in the mid- to high-fire range (around cone 6 through cone 10). At these temperatures the body vitrifies substantially: it becomes hard, durable and largely non-porous, so it makes sound functional ware — mugs, bowls, plates — that survives daily use and the dishwasher. Stoneware is the default body for most studio potters because it balances strength, workability and a wide glaze range. If you want one clay to learn on for functional pots, stoneware is the usual answer.

Porcelain — the high-fire refinement

Porcelain matures at the top of the range (high-fire, around cone 10, though lower-firing porcelains exist). Fired fully, it vitrifies into a dense, white, often translucent body prized for fine tableware and delicate forms. The trade-off is workability: porcelain is less plastic, less forgiving on the wheel, and can warp or slump if pushed. It rewards skill. Most potters meet it after some experience with stoneware rather than as a first clay.

Quick comparison

In short: earthenware fires coolest, stays porous, must be glazed for liquids, and is the easiest to work; stoneware fires hotter, vitrifies to a strong non-porous body, and is the all-round functional choice; porcelain fires hottest, is the finest and whitest, and is the most demanding to form. The single most important practical rule that ties them together: the clay and the glaze must be fired to the same cone, and your kiln must be able to reach it.

How to choose for your situation

Work backwards from your kiln. If your kiln tops out low, earthenware is your range. If you have a mid- or high-fire kiln and want durable functional ware, stoneware is the sensible default. Choose porcelain when whiteness, translucency or fine detail is the goal and you are ready for a less forgiving clay. And always pair the clay with glazes rated for the same cone.

Related reading

See how to choose a home kiln to make sure your kiln reaches the cone your clay needs, and pottery glazes 101 for matching glaze to body.

Sources & further reading