Sedimentary / Mineral

Banded Agate (Mutton-fat or Pork-stone variety)

Silicon Dioxide (SiO2) with iron oxide inclusions

AI-generated identification · may be incorrect

Hardness: 6.5-7 on Mohs scale. Color: Translucent tan, white, and reddish-brown bands. Luster: Vitreous to waxy. Structure: Cryptocrystalline. Cleavage: None (conchoidal fracture). Specific Gravity: 2.60-2.65.

Hardness: 6
Color: Translucent tan, white, and reddish-brown bands
Luster: Vitreous to waxy

Identified March 29, 2026More sedimentary / mineral →

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Physical properties

Formation & geological history

Formed in cavities within volcanic or sedimentary rocks through the deposition of silica from groundwater. The distinct 'meat-like' layers occur during rhythmic crystallization phases containing different concentrations of iron oxides. Most are from the Cenozoic era.

Uses & applications

Used primarily in lapidary arts for decorative carvings (famously 'Pork Stone' carvings), semi-precious jewelry, and as a collector's specimen due to its unique mimicry of food.

Geological facts

In Chinese culture, these specimens are often carved into 'Pork-Belly Stone' (Rouridong) sculptures. The most famous example is the Meat-Shaped Stone housed in the National Palace Museum in Taiwan, a Qing Dynasty masterpiece.

Field identification & locations

Identify in the field by its waxy texture and parallel, wavy banding that mimics muscle and fat. It will scratch glass but cannot be scratched by a steel nail. Common in Brazil, China, and the Lake Superior region of the USA.