metamorphic (man-made/engineered)

Porcelain (Kaolin-based)

Alumina silicate ceramic (composed primarily of Kaolinite: Al2Si2O5(OH)4)

Hardness: 7 Mohs; Color: White; Luster: Vitreous to dull; Crystal structure: Amorphous to microcrystalline (mullite); Cleavage: None (conchoidal fracture); Specific gravity: 2.3–2.5

Hardness: 7 Mohs
Color: White
Luster: Vitreous to dull

Identified March 22, 2026More metamorphic (man-made/engineered) →

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Physical properties

Hardness: 7 Mohs; Color: White; Luster: Vitreous to dull; Crystal structure: Amorphous to microcrystalline (mullite); Cleavage: None (conchoidal fracture); Specific gravity: 2.3–2.5

Formation & geological history

Formed by heating kaolin, feldspar, and silica (quartz) in a kiln at temperatures between 1,200 and 1,400 °C. This process (vitrification) mimics high-grade contact metamorphism on a fast timeline.

Uses & applications

Used for tableware, electrical insulators, laboratory equipment, dental crowns, and decorative fine art.

Geological facts

Porcelain was first developed in China during the Han Dynasty (206 BC – 220 AD). It is often called 'fine china' because for centuries, China was the only global source of the material.

Field identification & locations

Identify in the field by its high resonant ring when tapped, translucent quality when held to light, and extreme resistance to chemical attack and thermal shock.

Other metamorphic (man-made/engineered) specimens

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Man-made Polished Porcelain Tile (Artificial Geologic Lookalike)

Fused Silicate Ceramic with Alumina (Synthetic Kaolinite derivative)

Synthetic (Ceramic)

Quartz (Engineered Stone Countertop)

Silicon Dioxide (SiO2) with polymer resins

Sedimentary-like (Industrial Composite)

Asphalt Concrete (Bituminous Pavement)

Aggregates in Bitumen Matrix

Technogenic / Anthropogenic Pavement Material

N/A - Non-Geological Item

not a rock/mineral

Engineered Quartz Stone

Agglomerated Quartz (SiO2 + Polymer Resin)

mineral-based composite

Quartz (Engineered Quartz Surface)

Silicon Dioxide (SiO2) based composite

mineral (man-made composite)