Entry № 060
Blue Chert
Microcrystalline Silica
Sedimentary stone the sea pressed flat.
Chakra
Throat · Root
Element
Water · Earth
Zodiac
Cancer · Virgo

I. The Metaphysical Reading
How the stone has been held.
Blue chert is a plain working stone, carried by practitioners doing quiet daily grounding rather than dramatic clearings. Its association with old coastal sediments is read as a reminder that most patient work happens under water long before any land is made.
- Chakra
- Throat · Root
- Element
- Water · Earth
- Zodiac
- Cancer · Virgo
- Keynote
- Sedimentary stone the sea pressed flat.
II. The Scientific Reading
What the lattice actually does.
Blue chert is a sedimentary silica rock built from the microscopic silica skeletons of radiolarians and diatoms laid down on deep sea floors, later compacted and cemented into a dense cryptocrystalline stone. Its blue-grey colour comes from minor organic carbon and clay content. The Pacific coastal ranges of Oregon and California expose extensive chert sequences dating from the Jurassic and Cretaceous.
- Formula
- SiO₂ (with clay and organic matter)
- System
- Cryptocrystalline
- Hardness
- 6.5 – 7 (Mohs)
- Provenance
- USA (Pacific Northwest), Canada, Australia
References & Sources
Independent mineralogical references used to verify the scientific details above.
Mineral Profile
Fact Sheet
- Chemical Formula
- SiO₂ (with clay and organic matter)
- Crystal System
- Cryptocrystalline
- Mohs Hardness
- 6.5 – 7 (Mohs)
- Density
- 2.55 – 2.65 g/cm³
- Refractive Index
- 1.530 – 1.540
- Provenance
- USA (Pacific Northwest), Canada, Australia
- Color Origin
- Dense grey to slate blue with sharp conchoidal fracture
Related Crystals
Stones that share this lattice
Next in the Atlas
Blue Dolomite
Cool blue rock that softens a hard week.




