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Entry № 203

Gem Silica

Chrysocolla-Chalcedony

The rarest blue of the copper family, translucent at last.

Chakra

Throat · Heart

Element

Water · Air

Zodiac

Taurus · Gemini

Gem Silica

I. The Metaphysical Reading

How the stone has been held.

Gem silica is worked with as a stone of clear speech, held at the throat during teaching, mediation and long calls. Practitioners hold that its rarity is part of the medicine — it is the version of chrysocolla that has been sealed and made durable enough to be spoken through.

Chakra
Throat · Heart
Element
Water · Air
Zodiac
Taurus · Gemini
Keynote
The rarest blue of the copper family, translucent at last.

II. The Scientific Reading

What the lattice actually does.

Gem silica is chrysocolla naturally impregnated with chalcedony. Pure chrysocolla — a hydrated copper silicate — is soft, porous and easily damaged; when silica-rich groundwater percolates through it and fills the pore space with cryptocrystalline chalcedony, the resulting composite reaches quartz-level hardness while keeping chrysocolla's copper-driven blue. This is why gem silica is the only chrysocolla material considered a durable gemstone.

Formula
SiO₂ chalcedony impregnated with chrysocolla (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O
System
Trigonal (host chalcedony)
Hardness
6.5 – 7 (Mohs)
Provenance
USA (Arizona — Inspiration and Ray mines), Peru, Taiwan

References & Sources

Independent mineralogical references used to verify the scientific details above.

Mineral Profile

Fact Sheet

Chemical Formula
SiO₂ chalcedony impregnated with chrysocolla (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O
Crystal System
Trigonal (host chalcedony)
Mohs Hardness
6.5 – 7 (Mohs)
Density
2.55 – 2.70 g/cm³
Refractive Index
1.53 – 1.54
Provenance
USA (Arizona — Inspiration and Ray mines), Peru, Taiwan
Color Origin
Translucent turquoise to intense cyan-blue from copper

Related Crystals

Stones that share this lattice

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The cream deposit a geyser leaves as it breathes.