|
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 |
|
Benitoite |
1,754 |
|
|
|
3,73 |
3,73 |
bluish violet |
Dallas Gem Mine, San
Benito County, California, USA |
3.77ct |
|
|
|
|
|
strong blue |
inert |
GIA Gem Database 33927 |
|
Benitoite |
1,755 |
|
|
|
3,7 |
3,7 |
bluish violet |
Dallas Gem Mine, San
Benito County, California, USA |
3.36ct |
|
|
|
|
|
strong blue |
inert |
GIA Gem Database 33928 |
|
Benitoite |
1,756 |
1,8 |
0,044 |
0,044 |
3,65 |
3,65 |
blue |
|
0.19ct |
|
|
|
|
|
intens blue |
inert |
ACAM Lab 965 |
|
Benitoite |
1,756 |
|
|
|
3,68 |
3,68 |
orange |
|
2,29ct, heat treated |
|
|
|
|
|
medium blue |
strong orange |
Gems & Gemology 2022
Summer, 184-194 |
|
Benitoite |
1,757 |
1,804 |
0,043 |
0,047 |
3,65 |
3,8 |
blue to violetish blue |
New Idria District,
Benito County, California |
cause of blue colour has
not yet been determinated |
1,802 |
1,804 |
1,757 |
1,759 |
|
strong blue |
inert ; colourless: dull
red |
Gems & Gemology 1997
fall p166-187 |
|
Benitoite |
1,757 |
|
|
|
3,69 |
3,69 |
dark violet |
Dallas Gem Mine, San
Benito County, California, USA |
3.48ct |
|
|
|
|
|
strong blue |
inert |
GIA Gem Database 35170 |
TABLES
|
Stone |
RI
min |
RI
max |
Biref
min |
Biref
max |
Dens
min |
Dens
max |
ne
min |
ne
max |
no
min |
no
max |
Reference |
|
Benitoite |
1.75 |
1.814 |
0.047 |
0.047 |
3.61 |
3.69 |
|
|
|
|
Gemology Tools Professional 2010 |
|
Benitoite |
1.754 |
1.805 |
0.042 |
0.048 |
3.64 |
3.8 |
|
|
|
|
Gemmo.eu
|
|
Benitoite |
1.755 |
1.804 |
0.047 |
0.047 |
3.65 |
3.67 |
|
|
|
|
John Sinkakas,
Gemstone and mineral data book,1972 |
|
Benitoite |
1.756 |
1.804 |
0.044 |
0.047 |
3.64 |
3.68 |
1.800 |
1.804 |
1.756 |
1.757 |
http://www.geminterest.com |
|
Benitoite |
1.756 |
1.804 |
0.047 |
0.047 |
3.61 |
3.68 |
1.802 |
1.804 |
1.756 |
1.757 |
Tables of
Gemstone Identification, Roger Dedeyne, Ivo Quintens, 2007 |
|
Benitoite |
1.757 |
1.804 |
0.047 |
0.047 |
3.61 |
3.67 |
|
|
|
|
Bestimmungstabellen für Edelsteine,
Birgit Günther, 1981 |
|
Benitoite |
1.757 |
1.804 |
0.047 |
0.047 |
3.61 |
3.68 |
1.804 |
1.804 |
1.757 |
1.757 |
Gemme, Dati per l'identificazione, P. De
Stefano et al, 1993 |
|
Benitoite |
1.757 |
1.804 |
0.047 |
0.047 |
3.65 |
3.68 |
1.804 |
1.804 |
1.757 |
1.757 |
Gemmological Tables, Ulrich Henn,
2004 |
|
Benitoite |
1.757 |
1.804 |
0.047 |
0.047 |
3.64 |
3.68 |
|
|
|
|
http://www.gemmology.be |
|
Benitoite |
1.757 |
1.804 |
0.047 |
0.047 |
3.64 |
3.68 |
1.804 |
1.804 |
1.757 |
1.757 |
Joel Arem, Color
Encyclopedia of Gemstones, 1987 |
|
Benitoite |
1.757 |
1.804 |
0.047 |
0.047 |
3.65 |
3.68 |
|
|
|
|
Gems, R Webster,
5th edition 1994 |
|
Benitoite |
1
757 |
1
804 |
0.047 |
0.049 |
3.61 |
3.68 |
1.804 |
1.804 |
1.755 |
1.757 |
Tabellen zur Edelstein-Bestimmung,
Pschichholz FGA, 1975 |
CAUSE OF
COLOUR
|
Stone |
Colour |
Cause
of colour |
Reference |
|
Benitoite |
blue |
Fe²+-O-Ti4-
charge transfer (not fully proven) |
Gems & Gemology Summer 1988 |
MINERAL
INCLUSIONS
|
Inclusion |
Stone |
Reference |
|
actinolite |
Benitoite |
Gems & gemology 1997 fall p182 |
|
aegirine-augite |
Benitoite |
Gems & gemology 1997 fall p182 |
|
albite |
Benitoite |
Gems & gemology 1997 fall p182 |
|
apatite |
Benitoite |
Gems & gemology 1997 fall p182 |
|
diopside |
Benitoite |
Gems & gemology 1997 fall p182 |
|
djurleite |
Benitoite |
Gems & gemology 1997 fall p182 |
|
joaquinite |
Benitoite |
Gems & gemology 1997 fall p182 |
|
natrolite |
Benitoite |
Dr. W.F. Eppler, Praktische Gemmologie,
1984 |
|
neptunite |
Benitoite |
Gems & gemology 1997 fall p182 |
|
serandite |
Benitoite |
Gems & gemology 1997 fall p182 |
LOCALITIES
|
STONE |
LOCALITIES |
REFERENCE |
|||
|
Benitoite |
|
San Benito County |
California |
USA |
Joel Arem, Color
Encyclopedia of Gemstones, 1987 |
CHEMICAL DATA
|
Stone |
Colour |
Locality |
Reference |
SiO2 |
Al2O3 |
MnO |
MgO |
FeO |
TiO2 |
CaO |
Na2O |
V2O3 |
K2O |
SrO |
ZrO2 |
BaO |
|
|
Benitoite |
colourless |
Diamond Jo, Arkansas |
USA |
Gems & Gemology 1997 Fall p184 |
43.52 |
0.29 |
0.03 |
|
0.15 |
17.9 |
|
0.23 |
|
0.01 |
|
1.16 |
36.7 |
|
Benitoite |
blue |
Diamond Jo, Arkansas |
USA |
Gems & Gemology 1997 Fall p184 |
43.55 |
0.22 |
0.04 |
|
0.04 |
18.47 |
|
0.22 |
|
0.2 |
|
0.33 |
36.21 |
|
Benitoite |
pink |
Diamond Jo, Arkansas |
USA |
Gems & Gemology 1997 Fall p184 |
43.49 |
0.21 |
0.03 |
|
0.01 |
18.99 |
|
0.18 |
0.34 |
0.13 |
|
0.08 |
36.36 |
|
Benitoite |
blue |
Gem mine, California |
USA |
Gems & Gemology 1997 Fall p184 |
43.1 |
0.2 |
|
|
0.05 |
19.51 |
0.1 |
0.13 |
0.003 |
|
0.004 |
0.016 |
37.23 |
|
Benitoite |
colourless |
Gem mine, California |
USA |
Gems & Gemology 1997 Fall p184 |
42.62 |
0.04 |
|
|
0.01 |
19.44 |
0.006 |
0.14 |
0.002 |
|
0.003 |
0.108 |
37.27 |
|
Benitoite |
blue |
Ohmi |
Japan |
Gems & Gemology 1997 Fall p184 |
41.05 |
|
|
0.16 |
0 |
19.82 |
0.12 |
0.27 |
|
|
|
1.77 |
36.78 |
|
Benitoite |
blue |
Ohmi |
Japan |
Gems & Gemology 1997 Fall p184 |
43.16 |
0.1 |
0.11 |
0.14 |
0.033 |
19.11 |
0.24 |
0.75 |
|
0.21 |
|
|
36.04 |
|
Benitoite |
colourless |
Ohmi |
Japan |
Gems & Gemology 1997 Fall p184 |
43.55 |
0.18 |
0.05 |
0.12 |
0.081 |
19.3 |
0.28 |
0.84 |
|
0.44 |
|
|
34.82 |
|
Benitoite |
colourless |
Victor claim, California |
USA |
Gems & Gemology 1997 Fall p184 |
43.66 |
0.3 |
0.03 |
|
0.01 |
19.29 |
0.11 |
0.2 |
|
|
|
|
36.48 |