sedimentary
Fairy Stone (Menilite Concretion)
Carbonate-rich concretion (often Siderite or Calcite in Clay)
Hardness: 3.5-4.5 (Mohs scale), Color: Grey, tan, or brown, Luster: Dull/Earthy, Structure: Concretionary/Amorphous shapes, Specific Gravity: 3.0-3.9
- Hardness
- 3
Identified More sedimentary →
Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 3.5-4.5 (Mohs scale), Color: Grey, tan, or brown, Luster: Dull/Earthy, Structure: Concretionary/Amorphous shapes, Specific Gravity: 3.0-3.9
Formation & geological history
Formed in Paleozoic era glacial clay deposits where minerals precipitated around organic nuclei under high pressure and specific chemical conditions.
Uses & applications
Primarily used as collector specimens, lucky charms, and in metaphysical practices.
Geological facts
These are often called 'Gorgon Stones' or 'Fairy Stones' due to their bizarre, anthropomorphic, or animal-like shapes; some are over 10,000 years old.
Field identification & locations
Identified by their unique rounded, multi-lobed 'bubbled' appearance and smooth texture. Commonly found in riverbeds and glacial clay pits in Quebec (Harricana River) and parts of Europe.
More like this
Other sedimentary specimens
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Chert Breccia
Brecciated Chert (Microcrystalline Silica)
sedimentary
Sandstone Grain
Clastic Sedimentary Rock Grain (SiO2 dominated)
sedimentary
Shale or Slaty Mudstone
Argillaceous sedimentary rock
sedimentary
Sandstone
Arenite
sedimentary