Definition

Noun: 1. A type of clay: A fine, typically white or light-colored, non-plastic clay or rock. It is formed by the natural weathering of feldspar-rich rocks, such as granite. Its primary component is kaolinite. 2. A material for industry: This substance is valued for its use in ceramics (especially porcelain), as a filler in products like paper, paint, and rubber, and as an absorbent material.

Usage Examples

• Primary Use:
  • The high-quality china stone from this region is essential for producing fine porcelain.
  • Potters sometimes mix china stone into their clay bodies to reduce shrinkage during firing.
• Industrial Use:
  • The paper mill uses china stone as a filler to improve the brightness and opacity of its paper.
  • China stone is added to the paint mixture as an extender pigment.

Advanced Usage

• Technical Context: In geology and ceramics, "china stone" is distinguished from "china clay" (kaolin). While both originate from weathered feldspar, china stone is less pure, contains more silica and other minerals, and is not as plastic, making it behave more like a flux in ceramic glazes and bodies.
  • The recipe calls for china stone to act as a flux, lowering the melting point of the glaze mixture.

Variants and Related Words

• Cornish stone: A specific, historically important type of china stone mined in Cornwall, England.
• Petuntse: The Chinese term for a similar feldspathic material used in traditional Chinese porcelain.
• Kaolin / China clay: A related, purer, and more plastic white clay formed from similar processes.

Synonyms

• Porcelain stone
• Pottery stone (less common)

Notes on Different Meanings

• The term "china stone" is highly specific to geology, mining, and ceramics. It does not have common idiomatic or figurative meanings. It should not be confused with general stones or minerals from China.

Noun

1. a fine usually white clay formed by the weathering of aluminous minerals (as feldspar); used in ceramics and as an absorbent and as a filler (e.g., in paper)