Colour

Various shades of red from pink to dark deep red.

Cause of colour

Chromium

Optical Character

Isotropic

Pleochroism

Not applicable

Colour change

No

Spectrum; no polar Calibration in nm.

685/684 weak as absorption usually present as an emission line. Others in red if seen very weak. Band centred at 540 variable in width and intensity according to colour, as does absorption of violet.

Ordinary ray

Not applicable

Extraordinary ray

Not applicable

Alpha ray

Not applicable

Beta ray

Not applicable

Gamma ray

Not applicable

Emission lines

705;679;686;675;665;656;650;642;632:

Database reference

RD2; see others in  RD1;RD3:PK1;PK2:

Notes

Synthetic stones, only display the dominant line at 686 in emission.