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Entry № 060

Blue Chert

Microcrystalline Silica

Sedimentary stone the sea pressed flat.

Chakra

Throat · Root

Element

Water · Earth

Zodiac

Cancer · Virgo

Blue Chert

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

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Blue Dolomite

Cool blue rock that softens a hard week.