Septarian Nodule (Dragon Stone) Value Guide

Dating back to the Late Cretaceous and Paleogene periods, Septarian nodules are unique sedimentary formations that began as mud balls on ancient seafloors. These 'Dragon Stones' are highly collectible for their striking geometric patterns and sparkling drusy interiors formed by mineral-rich fluids filling prehistoric cracks.

What Is Septarian Nodule (Dragon Stone) Worth?

The typical price range for Septarian Nodule (Dragon Stone) is $30 - $85 based on recent sales. However, values can vary depending on the item's condition, rarity, and other factors such as:

• The presence and quality of sparkling drusy calcite or limonite crystals significantly increase market value.
• Specimens from notable locations like Utah, Madagascar, or Morocco carry different premiums based on color saturation.
• The quality of the polish on the outer matrix and the clarity of the internal geometric patterns.
• Overall size and the structural integrity of the nodule, with larger, unbroken hollow centers being more desirable.

How to Identify Septarian Nodule (Dragon Stone)?

• Look for a distinct contrast between the brown aragonite lines and the yellow or clear calcite crystals inside.
• Authentic specimens feature a heavy, sedimentary outer matrix typically in shades of gray or earthy brown.
• Check for the presence of 'drusy' textures, which appear as tiny, sparkling crystal points within the hollow center or cracks.
• Verify the angular, cracked appearance known as 'septaria,' which is a natural result of mineral shrinkage over millions of years.

History of Septarian Nodule (Dragon Stone)

Septarian nodules formed in the Late Cretaceous to early Paleogene when mud balls developed cracks and mineral-rich fluids later filled them with calcite, aragonite, and siderite, producing the characteristic angular patterns and drusy centers. These 'dragon stones' became popular as decorative and metaphysical specimens in the 20th and 21st centuries for collectors and lapidary use.