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Nicknamed the "dragon stone," septaria has unique mineral patterns that resemble tree branches. Specimens are usually in the form of sliced nodules ranging from an inch in diameter to more than three feet across. They are estimated to have formed between 50 and 70 million years ago after periodic volcanic eruptions killed small sea life. The shells and carcasses of these creatures sank to the sea bed, where sediments accumulated around them to form nodules or balls of mud. When the waters eventually receded, the mud balls dried out and began to shrink and crack into the beautiful patterns that you see inside the septarian nodules.

Septaria Polished
Septaria Classification
Common Name Septaria
Species Rock
Septaria Optical Properties
Transparency Opaque
Optic Character NA
Optic Sign NA
Pleochroism None
Septaria Characteristic Physical Properties
Inclusions Septaria are cracks or separations in rock.
Luster Dull
Cleavage None
Septaria Chemistry & Crystallography
Crystal System NA
Chemistry Classification Rock

Septaria Colors

  • Yellow Septaria Yellow
  • Brown Septaria Brown
  • Multi-color Septaria Multi-color

Alternate Names

Septarian Concretions, Septarian Nodules, beetle stone, turtle stone

Countries of Origin

Morocco; Unknown


Normal, gentle care, avoid acids.

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Tim Matthews


Tim Matthews

Tim Matthews is President and Chief Executive Officer of Jewelry Television® (JTV), as well as a member of the company's Board of Directors. He oversees and leads all aspects of the company's powerful omni-digital retail platform that uniquely specializes in fine jewelry and gemstones. His passion for business and gemstones has led him to become a recognized expert in the field of gemology. He is a life member of the Gemmological Association of Great Britain (Gem-A) and has earned Gem-A's highest degrees, the Gemmology (FGA) and Diamond (DGA) diplomas. He is also a Graduate Gemologist (GG) of the Gemological Institute of America (GIA) and has also completed GIA's Graduate Diplomas in Diamonds, Colored Stones and Pearls. Under his leadership, JTV has become the leader in the sourcing and selling of color gemstones and jewelry.

This page was created on June 27, 2014.

This page was last edited on October 24, 2019.