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INVESTIGATIONS

Stone

RI min

RI max

Biref min

Biref max

Dens min

Dens max

Colour

Location

Info

ne min

ne max

no min

no max

Spectrum

UVS

UVL

Reference

Musgravite

1.715

1.725

0.004

0.005

3.61

3.64

light purple, purplish violet, violet, greyish violet, bluish violet, bluish grey

Tanzania, Africa

 

1.715

1.720

1.719

1.725

 

inert

inert

The Journal of Gemmology 2007 Nr 7/8, p367-382

Musgravite

1.715

1.722

0.007

0.007

3.61

3.61

bluish violet

 

3.58ct

 

 

 

 

broad absorption below 425nm  and between 460-475nm

inert

inert

GIA Gem Database  35836

Musgravite

1.717

1.728

0.006

0.007

3.61

3.69

greyish mauve, brownish purple, greenish grey, greyish blue

 

 

1.717

1.721

1.721

1.728

 

 

 

The Journal of Gemmology 2005 29, 5/6, p281-289

Musgravite

1.718

1.723

 

 

3.66

3.66

near colourless

Myanmar

0.11 and 0.24ct

 

 

 

 

 

weak red

very weak orange

Gems & Gemology 2013 Spring, p54

Musgravite

1.719

1.726

0.007

0.007

3.61

3.61

 

 

 

 

 

 

 

band at 460nm

inert

inert

Gems & Gemology 2001 spring, p61

Musgravite

1.719

1.739

 

 

3.62

3.68

greyish mauve

 

 

1.719

1.735

1.725

1.739

 

 

 

The Journal of Gemmology 1992 Vol23, N8

Musgravite

1.72

1.725

0.005

0.05

3.64

3.64

greyish violet

Sri Lanka

1ex

1.720

1.720

1.725

1.725

 

 

 

The Australian Gemmologist 2006 jul-sep, p486

Musgravite

1.72

1.73

 

 

3.6

3.6

dark green, light purple

 

5.95ct green, 1.79ct light purple

 

 

 

 

 

 

 

The Gem and Jewelry Institute of Thailand - Lab Notes 2019 15/01

Musgravite

1.721

1.728

0.007

0.07

3.69

3.69

dark brownish purple

 

0.60ct

 

 

 

 

 

inert

inert

Gems & Gemology 1997 Summer, p145-146

 

TABLES

Stone

RI min

RI max

Biref min

Biref max

Dens min

Dens max

ne min

ne max

no min

no max

Reference

Musgravite

1.717

1.728

0.004

0.006

3.61

3.69

1.717

1.721

1.721

1.728

Tables of Gemstone Identification, Roger Dedeyne, Ivo Quintens, 2007 

Musgravite

1.719

1.739

0.014

0.016

3.62

3.68

1.719

1.735

1.725

1.739

Gemmological Tables, Ulrich Henn, 2004 

Musgravite

1.72

1.729

0.003

0.005

3.67

3.7

 

 

 

 

Gemmo.eu 2013

 

CAUSE OF COLOUR

 

MINERAL INCLUSIONS

 

LOCALITIES

STONE

LOCALITIES

REFERENCE

Musgravite

 

 

 

Sri Lanka

The Australian Gemmologist 2006 jul-sep, p486

Musgravite

 

Tunduru

Ruvuma Region

Tanzania

Journal of Gemmology (2007), 30(7/8), 367-382.

 

CHEMICAL DATA (%)

Stone

Colour

Locality

Reference

Al2O3

MnO

MgO

FeO

TiO2

Cr2O3

Fe2O3

K2O

Ga2O3

ZnO

BeO

Musgravite

greyish blue

 

Sri Lanka

The Journal of Gemmology 2005, 29, 5/6, 281-289

73.07

0.02

19.09

0.91

0.01

0.01

0.01

 

 

 

6

Musgravite

 

 

Tanzania

The Journal of Gemmology 2007, 30, 7/8, p 373

73.9

0.05

18.5

1.41

0.01

0.01

0.01

 

 

0.14

6.38

Musgravite

dark green

 

 

The Gem and Jewelry Institute of Thailand - Lab Notes 15/01/2019

73.75

0.07

16.66

 

 

 

 

2.95

0.07

0.42

6.08

Musgravite

light purple

 

 

The Gem and Jewelry Institute of Thailand - Lab Notes 15/01/2019

74.53

0.03

18.08

 

 

 

 

1.09

0.08

0.11

6.08