Entry № 306
Orca Agate
Banded chalcedony
Black-and-white bands that echo the ocean's diplomat.
Chakra
Root · Throat
Element
Water · Earth
Zodiac
Pisces · Gemini

I. The Metaphysical Reading
How the stone has been held.
Orca agate is worked with as a stone of balance, communication and emotional depth. Its dramatic contrast is read as a reminder that light and shadow can coexist gracefully, supporting honest expression during difficult conversations.
- Chakra
- Root · Throat
- Element
- Water · Earth
- Zodiac
- Pisces · Gemini
- Keynote
- Black-and-white bands that echo the ocean's diplomat.
II. The Scientific Reading
What the lattice actually does.
Orca agate is a trade name for a strikingly banded agate whose alternating black and white layers are microcrystalline quartz precipitated in cavities within volcanic rocks. The black bands are typically colored by manganese or iron oxides, while the white bands are relatively pure silica.
- Formula
- SiO₂
- System
- Trigonal (microcrystalline)
- Hardness
- 6.5 – 7 (Mohs)
- Provenance
- Madagascar, India, Brazil
References & Sources
Independent mineralogical references used to verify the scientific details above.
Mineral Profile
Fact Sheet
- Chemical Formula
- SiO₂
- Crystal System
- Trigonal (microcrystalline)
- Mohs Hardness
- 6.5 – 7 (Mohs)
- Density
- 2.58 – 2.64 g/cm³
- Refractive Index
- 1.530 – 1.540
- Provenance
- Madagascar, India, Brazil
- Color Origin
- Bold black and white banding, sometimes with grey
Related Crystals
Stones that share this lattice
Next in the Atlas
Orchid Calcite
Soft floral layers for the heart's patience.




