Entry № 194
Fossil Shell Jasper
Turritella Agate
Chalcedony that swallowed a shoreline.
Chakra
Root · Sacral
Element
Earth · Water
Zodiac
Cancer · Capricorn

I. The Metaphysical Reading
How the stone has been held.
Fossil shell jasper is worked with as a stone of ancestral time, kept nearby during genealogy, grief tending and any practice that asks a person to hold the past in cupped hands. Practitioners hold it as a reminder that a life can be recorded as clearly as a signature.
- Chakra
- Root · Sacral
- Element
- Earth · Water
- Zodiac
- Cancer · Capricorn
- Keynote
- Chalcedony that swallowed a shoreline.
II. The Scientific Reading
What the lattice actually does.
Fossil shell jasper — traditionally sold as turritella agate — is a Wyoming freshwater chalcedony from the Eocene Green River Formation in which dense populations of high-spired snail shells (properly Elimia tenera, misidentified for a century as Turritella) have been silicified and preserved in cross-section within a brown chalcedonic matrix.
- Formula
- SiO₂ chalcedony replacing CaCO₃ shells
- System
- Trigonal (microcrystalline)
- Hardness
- 6.5 – 7 (Mohs)
- Provenance
- USA (Wyoming — Green River Formation), Indonesia
References & Sources
Independent mineralogical references used to verify the scientific details above.
Mineral Profile
Fact Sheet
- Chemical Formula
- SiO₂ chalcedony replacing CaCO₃ shells
- Crystal System
- Trigonal (microcrystalline)
- Mohs Hardness
- 6.5 – 7 (Mohs)
- Density
- 2.58 – 2.64 g/cm³
- Refractive Index
- 1.530 – 1.540
- Provenance
- USA (Wyoming — Green River Formation), Indonesia
- Color Origin
- Warm brown to honey chalcedony packed with pale cross-sectioned spiral shells
Related Crystals
Stones that share this lattice
Next in the Atlas
Franklinite
A black spinel from the strangest orebody in America.




