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 GEMSTONE SPECTRA

(EXCEL FILES)

COLOURLESS STONES

         CS1      

 RED STONES  

  RD1 Dark red

   RD2 Pinkish red

  RD3 Orangy red

RD4 Slightly purplish red

  RD5  Purplish red

PINK STONES 

 PK1 Lilac pink

   PK2 Pink and orangy pink

PK3  Brownish and purplish pink

ORANGE STONES

OR1

YELLOW STONES

YL1

GREEN STONES

GN1 Green

GN2 Yellowish and greyish green

GN3 Bluish green

 GN4 Dark and brownish green

BROWN STONES

BN1 Light brown

BN2 Dark brown

BLUE STONES

BL1 Blue

BL2 Greenish blue

BL3 Lavender and indigo blue

VIOLET AND PURPLE STONES

VT - PL Violet and Purple

Periodically other gemstones will be added to these files

 

Diffraction spectra of red spinel

See my  DECLARATION OF COPYRIGHT

 

Colour Properties of Red Spinel

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.

 

 

 

 

Copyright John S. Harris 2000-2016

 

 SPECTRA OF

 PRINCIPAL 

COMMERCIAL GEMS

ALEXANDRITE

ALMANDINE GARNET

CHRYSOBERYL

DIAMOND

EMERALD

GREEN JADEITE

PERIDOT

RUBY

BLUE SAPPHIRE  

GREEN & BLUE SPINEL

SYN. BLUE SPINEL  & Co. GLASS

SYN. COLOUR CHANGE CORUNDUM

ZIRCON (High type)

ZIRCON (Low type)

Other pages are under construction

COLOUR FILTERS

 (EXCEL FILES) 

CF1 Basic Colour Filters

CF2 Special Colour Filters

EDUCATIONAL C. D.

  A GUIDE TO THE   SPECTROSCOPE