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Foundation 5 of 12
Revelation 21:20
Sardonyx
σαρδόνυξBanded layers of light- and dark-toned quartz, each band still splitting light at the crystallite level.
Mineralogy
- Greek name
- sardonux (σαρδόνυξ)
- Modern identification
- Banded Chalcedony
- Chemical formula
- SiO₂
- Crystal system
- Trigonal
- Optical class
- Uniaxial (+)
- Birefringence (Δn)
- 0.004–0.009
- Refractive indices
- 1.530–1.539
- Color / appearance
- Red-white bands
Alternating sard and white chalcedony layers.
The light between
Sardonyx is anisotropic: enter it with a single ray of light and it leaves as two, split apart by the crystal's inner order. This is birefringence, the same property shared by every one of the twelve foundation stones, and by none of the cubic stones left out of the list.
In the high-priestly breastplate of Exodus 28, this position held Sapphire in the Septuagint reckoning.
Hold the light in your hand
The Revelation Stones collection brings each foundation stone into the room with you, and the Light Between research explains what you are looking at.