|
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 |
1,715 |
1,721 |
0,006 |
0,006 |
3,6 |
3,6 |
red |
|
Cr-bearing, 1,59ct |
|
|
|
|
|
|
|
The Journal of Gemmology
2023 38 (6), p548-551 |
|
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, N°8 |
|
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 |
CaO |
Cr2O3 |
V2O3 |
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 |
|
Musgravite |
red |
|
|
The Journal of Gemmology,
2023, 38(6),p549 |
73,06 |
|
19,32 |
0,09 |
0,02 |
0,05 |
0,51 |
0,03 |
|
0,01 |
0,9 |
0,44 |
6,08 |