Entry № 213
Green Aventurine
Quartzite with Fuchsite
Quartz that shimmers because tiny mica flakes lie the same way.
Chakra
Heart
Element
Earth
Zodiac
Taurus · Libra

I. The Metaphysical Reading
How the stone has been held.
Green aventurine is worked with as a stone of quiet luck and forward motion, kept in a pocket during interviews, new ventures and any moment that asks a person to try. Its name comes from the Italian a ventura — 'by chance' — and practitioners hold that it opens the small openings that make chance possible.
- Chakra
- Heart
- Element
- Earth
- Zodiac
- Taurus · Libra
- Keynote
- Quartz that shimmers because tiny mica flakes lie the same way.
II. The Scientific Reading
What the lattice actually does.
Green aventurine is a metamorphic quartzite whose distinctive shimmer — 'aventurescence' — comes from small parallel flakes of chromium-rich fuchsite mica included in the quartz matrix. When light reflects off the aligned flakes, the polished surface flashes green. The name predates the mineral: an 18th-century Venetian glass called avventurina was made the same way, with copper flakes suspended in glass.
- Formula
- SiO₂ quartzite with fuchsite mica K(Al,Cr)₂(AlSi₃O₁₀)(OH)₂
- System
- Aggregate (trigonal quartz + monoclinic mica)
- Hardness
- 6.5 – 7 (Mohs)
- Provenance
- India (Karnataka — the principal source), Brazil, Russia, Tanzania
References & Sources
Independent mineralogical references used to verify the scientific details above.
Mineral Profile
Fact Sheet
- Chemical Formula
- SiO₂ quartzite with fuchsite mica K(Al,Cr)₂(AlSi₃O₁₀)(OH)₂
- Crystal System
- Aggregate (trigonal quartz + monoclinic mica)
- Mohs Hardness
- 6.5 – 7 (Mohs)
- Density
- 2.64 – 2.69 g/cm³
- Refractive Index
- 1.544 – 1.553 (bulk)
- Provenance
- India (Karnataka — the principal source), Brazil, Russia, Tanzania
- Color Origin
- Medium green from chromium-bearing fuchsite mica inclusions
Related Crystals
Stones that share this lattice
Next in the Atlas
Green Dolomite
A pale-green carbonate that only exists because a sea existed.




