|
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 |
Sugilite |
1.6 |
1.6 |
|
|
2.75 |
2.75 |
purple |
Africa |
slab, RI : hazy due to poor
polish |
|
|
|
|
line 419
nm |
|
|
Gems & Gemology 1981 Summer,
p105-106 |
Sugilite |
1.607 |
1.609 |
|
|
2.76 |
2.8 |
violet, purplish
red |
Wessels mine,
South-Africa |
|
|
|
|
|
|
|
|
Zeitschrift der Deutschen Gemmologischen
Gesellschaft 1986 Jg 35, Nr 1-2,
p65-67 |
Sugilite |
1.607 |
1.607 |
|
|
2.74 |
2.8 |
bluish purple to purple to
reddish purple |
Wessels Mine, South
Africa |
|
|
|
|
|
bands at 411, 419 (most
intense), 445, 495, broad regions of absorption below 430 and from 500 to
600nm |
inert |
inert |
Gems & Gemology 1987 Summer,
p78-89 |
TABLES
Stone |
RI min |
RI max |
Biref min |
Biref max |
Dens min |
Dens max |
ne min |
ne max |
no min |
no max |
Reference |
Sugilite |
1.59 |
1.611 |
0.003 |
0.005 |
2.69 |
2.8 |
1.590 |
1.607 |
1.595 |
1.611 |
Gemme, Dati per l'identificazione, P. De Stefano
et al, 1993
|
Sugilite |
1.59 |
1.61 |
0.003 |
0.005 |
2.74 |
2.74 |
1.590 |
1.607 |
1.595 |
1.610 |
Joel Arem, Color Encyclopedia
of Gemstones, 1987
|
Sugilite |
1.59 |
1.61 |
0.002 |
0.005 |
2.73 |
2.75 |
1.590 |
1.607 |
1.595 |
1.610 |
http://www.geminterest.com
|
Sugilite |
1.59 |
1.595 |
0.003 |
0.005 |
2.74 |
2.74 |
|
|
|
|
Tables of Gemstone
Identification, Roger Dedeyn, Ivo Quintens, 2007
|
Sugilite |
1.59 |
1.612 |
0.002 |
0.005 |
2.72 |
2.84 |
|
|
|
|
Gemmo.eu 2013
|
Sugilite |
1.595 |
1.607 |
0.003 |
0.005 |
2.72 |
2.75 |
|
|
|
|
http://www.gemmology.be
|
Sugilite |
1.605 |
1.611 |
0 |
0.003 |
2.74 |
2.79 |
|
|
|
|
Gemology Tools Professional 2010
|
Sugilite |
1.606 |
1.611 |
0.003 |
0.005 |
2.69 |
2.79 |
1.606 |
1.607 |
1.610 |
1.611 |
Tables of Gemstone
Identification, Roger Dedeyn, Ivo Quintens, 2007
|
Sugilite |
1.607 |
1.61 |
0.003 |
0.003 |
2.74 |
2.8 |
1.607 |
1.607 |
1.610 |
1.610 |
Gemmological Tables, Ulrich Henn, 2004
|
Sugilite |
1.607 |
1.61 |
0.004 |
0.004 |
2.74 |
2.74 |
|
|
|
|
Gems, R Webster, 5th edition
1994
|
Sugilite |
1.607 |
1.611 |
0.001 |
0.004 |
2.69 |
2.79 |
|
|
|
|
Bestimmungstabellen für Edelsteine, Birgit
Günther, 2008
|
CAUSE OF COLOUR
Stone |
Colour |
Cause of
colour |
Reference |
Sugilite |
purple |
Mn³+ and Fe³+ presumably in
octahedral coordination |
Gems & Gemology Summer
1988 |
MINERAL INCLUSIONS
LOCALITIES
STONE |
LOCALITIES |
REFERENCE | |||
Sugilite |
Wessels Mine,
Hotazel |
Kalahari manganese
fields |
Northern Cape
Province |
South
Africa |
Gems & Gemology Summer
1988 |
CHEMICAL DATA (%)