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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 green jadeite

See my  DECLARATION OF COPYRIGHT

Colour Properties of Green Jadeite

Colour

Pale to bright emerald green

Cause of colour

Chromium

Optical Character

Biaxial positive ( Polycrystalline)

Pleochroism

Not detectable

Colour change

No

Spectrum; no polar, calibration in nm.

Untreated – A strong line in violet at 437 with a weaker line at 433 due to iron. Also a line in deep red at 691 due to chromium and weaker lines at 630 and 655 may also be seen. Treated (Dyed) – Diffuse broad band centred at approximately 650 and in some specimens a weak diffuse 437.

Ordinary ray

Not applicable

Extraordinary ray

Not applicable

Alpha ray

Not detectable

Beta ray

Not detectable

Gamma ray

Not detectable

Emission lines

No

Database reference

GN1.

Notes

The  diagnostic line at 437 due to iron may occur also in colourless jadeite

 

 

 

 

 

Copyright John S. Harris 2000-2016

 

 PRINCIPAL 

SPECTRA OF

COMMERCIAL GEMS

ALEXANDRITE

ALMANDINE GARNET

CHRYSOBERYL

DIAMOND

EMERALD

PERIDOT

RUBY

BLUE SAPPHIRE

RED SPINEL

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