|
INVESTIGATIONS
Stone |
RI
min |
RI
max |
Biref
min |
Biref
max |
Dens
min |
Dens
max |
Colour |
Locality |
Info |
nx
min |
nx
max |
ny
min |
ny
max |
nz
min |
nz
max |
Spectrum |
UVS |
UVL |
Reference |
Gypsum |
1.52 |
1.52 |
|
|
2.31 |
2.31 |
pink (dyed) |
|
14.32ct, cabochon, dyed, spot RI |
|
|
|
|
|
|
2 bands in the green |
patchy yellow-orange |
patchy yellow-orange |
Gems & Gemology 2009 Winter,
p309-310 |
TABLES
Stone |
RI
min |
RI
max |
Biref
min |
Biref
max |
Dens
min |
Dens
max |
nx
min |
nx max |
ny
min |
ny
max |
nz
min |
nz
max |
Reference |
Gypsum |
1.52 |
1.53 |
0.01 |
0.01 |
2.3 |
2.33 |
1.520 |
1.520 |
1.523 |
1.523 |
1.530 |
1.530 |
Joel Arem, Color Encyclopedia of Gemstones,
1987 |
Gypsum |
1.52 |
1.52 |
|
|
2.2 |
2.4 |
|
|
|
|
|
|
John Sinkakas, Gemstone and mineral data
book,1972 |
Gypsum |
1.52 |
1.529 |
0.009 |
0.009 |
2.2 |
2.4 |
|
|
|
|
|
|
Bestimmungstabellen für Edelsteine,
Birgit Günther, 1981 |
Gypsum |
1.52 |
1.53 |
0.009 |
0.01 |
2.2 |
2.4 |
1.520 |
1.521 |
|
|
1.529 |
1.530 |
Gemme, Dati per l'identificazione, P. De
Stefano et al, 1993 |
Gypsum |
1.52 |
1.53 |
0.01 |
0.01 |
2.3 |
2.33 |
|
|
|
|
|
|
http://www.gemmology.be |
Gypsum |
1.52 |
1.53 |
0.01 |
0.01 |
2.28 |
2.35 |
|
|
|
|
|
|
Tabellen zur Edelstein-Bestimmung,
Pschichholz FGA, 1975 |
Gypsum |
1.52 |
1.53 |
0.01 |
0.01 |
2.3 |
2.33 |
1.520 |
1.520 |
1.523 |
1.523 |
1.530 |
1.530 |
http://www.geminterest.com |
Gypsum |
1.52 |
1.53 |
0.01 |
0.01 |
2.3 |
2.33 |
|
|
|
|
|
|
Gems, R Webster, 5th edition 1994 |
Gypsum |
1.52 |
1.53 |
0.01 |
0.01 |
2.3 |
2.33 |
|
|
|
|
|
|
Tables of Gemstone Identification, Roger Dedeyne,
Ivo Quintens, 2007 |
Gypsum |
1.52 |
1.53 |
0.008 |
0.011 |
2.28 |
2.35 |
|
|
|
|
|
|
Gemmo.eu 2013 |
Gypsum |
1.521 |
1.531 |
0.01 |
0.01 |
2.2 |
2.4 |
1.521 |
1.521 |
1.523 |
1.523 |
1.531 |
1.531 |
Gemmological Tables, Ulrich Henn,
2004 |
Gypsum |
1.528 |
1.53 |
0.009 |
0.01 |
2.25 |
2.35 |
|
|
|
|
|
|
Gemology Tools Professional 2010 |
CAUSE OF
COLOUR
Stone |
Colour |
Cause
of colour |
Reference |
Gypsum |
all colours |
colour usually due to dyes exclusively, except for some
brown staining due to hydrous iron oxides |
Gems & Gemology Summer 1988 |
MINERAL
INCLUSIONS
Inclusion |
Stone |
Reference |
atacamite |
Gypsum |
E.J. Gübelin and J.I. Koivula, Photoatlas of inclusions in Gemstones,
volume 3 |
azurite |
Gypsum |
E.J. Gübelin and J.I. Koivula, Photoatlas of inclusions in Gemstones,
volume 3 |
livingstonite |
Gypsum |
E.J. Gübelin and J.I. Koivula, Photoatlas of inclusions in Gemstones,
volume 3 |
malachite |
Gypsum |
E.J. Gübelin and J.I. Koivula, Photoatlas of inclusions in Gemstones,
volume 3 |
LOCALITIES
CHEMICAL DATA