Entry № 227
Guinea Fowl Jasper
Chalcedony (Orbicular, Madagascar)
Madagascan jasper spotted like the bird that shares its name.
Chakra
Root
Element
Earth
Zodiac
Virgo · Capricorn

I. The Metaphysical Reading
How the stone has been held.
Guinea fowl jasper is worked with as a stone of pattern recognition and camouflage wisdom, held when someone needs to blend into a group while keeping their individual spots intact. It is a stone of belonging without conformity.
- Chakra
- Root
- Element
- Earth
- Zodiac
- Virgo · Capricorn
- Keynote
- Madagascan jasper spotted like the bird that shares its name.
II. The Scientific Reading
What the lattice actually does.
Guinea fowl jasper is a silicified rhyolite or chalcedony from Madagascar that displays a distinctive orbicular or spotted pattern of grey, black, and cream chalcedony in spherical or ellipsoidal aggregates. The spots form during devitrification of volcanic glass, where silica-rich solutions precipitate successive layers of chalcedony around nuclei such as iron oxide or clay minerals. The pattern is the result of rhythmic precipitation, similar to ocean jasper.
- Formula
- SiO₂ (cryptocrystalline chalcedony)
- System
- Trigonal
- Hardness
- 6.5 – 7 (Mohs)
- Provenance
- Madagascar
References & Sources
Independent mineralogical references used to verify the scientific details above.
Mineral Profile
Fact Sheet
- Chemical Formula
- SiO₂ (cryptocrystalline chalcedony)
- Crystal System
- Trigonal
- Mohs Hardness
- 6.5 – 7 (Mohs)
- Density
- 2.58 – 2.64 g/cm³
- Refractive Index
- 1.530 – 1.543
- Provenance
- Madagascar
- Color Origin
- Grey, black, and cream spotted pattern from rhythmic chalcedony precipitation
Related Crystals
Stones that share this lattice
Next in the Atlas
Guinea Fowl Quartz
Quartz that carries the spotted signature of the guinea fowl.




