Sedimentary / Mineral
Banded Agate (Mutton-fat or Pork-stone variety)
Silicon Dioxide (SiO2) with iron oxide inclusions
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
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Physical properties
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.
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.
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