Shi Yan (Fossil Shell) — Water-Refined Shi Yan Zi Herbal Mineral for TCM Use

Shi Yan (石燕), also known as Shi Yan Zi (石燕子) or Yan Zi Shi (燕子石), is a traditional mineral-based substance used in Traditional Chinese Medicine (TCM) and prepared in water-refined (水飞) form. Historically classified among the shell and mineral medicines, Shi Yan has been prized as a substance traditionally used to clear heat, promote diuresis, and support the smooth movement of fluids. Its nature is cool and its flavor is sweet and astringent, making it a gentle yet focused material in classical herbal formulas.

Key Selling Points

• Traditional mineral-based TCM substance
• Water-refined (水飞) fine preparation
• Known as Shi Yan Zi or Yan Zi Shi
• Sold as an edible agricultural product
• 500 g bulk pack for herbal use

Quality & Sensory

Each batch is carefully processed using the traditional water-refined (水飞) method, yielding a fine, uniform powder with a pale grey to ivory tone and a smooth, silky texture. It has a faint mineral aroma and a mild, subtly astringent taste. When decocted, it settles into a gentle, slightly cloudy infusion that carries the mineral character of the material without harshness.

Technical Specifications

Usage Scenarios

• Traditional herbal decoction formulas
• Blended with other mineral or shell medicines
• Classical TCM preparation and study
• Bulk herbal ingredient supply
• Traditional wellness formulations

Traditional Uses

In classical TCM practice, Shi Yan is decocted into formulas alongside other mineral and herbal ingredients, often paired with substances that support fluid movement and heat clearing. It appears in traditional decoctions and compound preparations, and in folk practice it has been used in formulas addressing damp-heat patterns and urinary discomfort. As a water-refined material, it is typically added to decoctions in its fine powder form or simmered in a cloth bag with other ingredients.

FAQ Q&A