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Foundation 7 of 12
Revelation 21:20

Chrysolite

χρυσόλιθος

Splits light so strongly that in a large stone you can see doubled edges with the naked eye.

Mineralogy
Greek name
chrysolithos (χρυσόλιθος)
Modern identification
Olivine / Peridot
Chemical formula
(Mg,Fe)₂SiO₄
Crystal system
Orthorhombic
Optical class
Biaxial (+)
Birefringence (Δn)
0.036–0.038
Refractive indices
1.654–1.690
Color / appearance
Yellow-green to olive

Second-strongest birefringence in the group; visible doubling in large specimens.

The light between

Chrysolite 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 Ligure (Jacinth?) 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.