|
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 |
Hornblende |
1.62 |
1.642 |
0.022 |
0.022 |
3.12 |
3.12 |
greenish brown to brown |
Embilipitiya, Sri Lanka |
|
1.620 |
1.620 |
1.632 |
1.632 |
1.642 |
1.642 |
|
|
|
Zeitschrift der Deutschen Gemmologischen
Gesellschaft 1993 Dec, p163-169 |
hornblende |
1.62 |
1.635 |
0.015 |
0.015 |
3.09 |
3.09 |
greenish yellow |
Baffin Island, Nunavut, Canada |
2.60ct |
|
|
|
|
|
|
no features |
inert |
inert |
GIA Gem Database 35409 |
Hornblende |
1.625 |
1.647 |
0.02 |
0.02 |
3.09 |
3.09 |
greenish-brown |
Baffin Island, Nunavut Territory, Canada |
biaxial positive, 1.62ct - 3.03ct |
1.625 |
1.627 |
1.632 |
1.633 |
1.644 |
1.647 |
|
moderate : yellow |
inert |
The Journal of Gemmology 1986 Vol20, N°2,p100-107 |
Ferrohornblende |
1.65 |
1.65 |
|
|
3.36 |
3.36 |
black |
|
beads, spot RI |
|
|
|
|
|
|
|
|
|
Gems & Gemology 1994 Fall, p186-187 |
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 |
Hornblende |
1.615 |
1.725 |
0.014 |
0.022 |
3.1 |
3.3 |
|
|
|
|
|
|
Gemmo.eu 2013 |
Hornblende |
1.62 |
1.642 |
0.022 |
0.022 |
3.12 |
3.12 |
1.620 |
1.620 |
1.632 |
1.620 |
1.642 |
1.642 |
Gemmological Tables, Ulrich Henn,
2004 |
Ferrohornblende |
1.641 |
1.727 |
0.014 |
0.021 |
3.12 |
3.3 |
1.641 |
1.704 |
1.657 |
1.718 |
1.662 |
1.727 |
Tables of Gemstone Identification, Roger Dedeyne,
Ivo Quintens, 2007 |
CAUSE OF
COLOUR
Stone |
Colour |
Cause
of colour |
Reference |
Hornblende |
green to brown |
Fe³+ in various sites |
Gems & Gemology Summer 1988 |
MINERAL
INCLUSIONS
LOCALITIES
STONE |
LOCALITIES |
REFERENCE |
|||
hornblende |
|
Baffin Island |
Northwest Territories |
Canada |
The Journal of Gemmology 1986, Vol 20, N°2, p100-107 |
CHEMICAL DATA
(%)
Stone |
Colour |
Locality |
Reference |
SiO2 |
Al2O3 |
MgO |
FeO |
TiO2 |
CaO |
Na2O |
Cr2O3 |
V2O3 |
K2O |
F |
|
Hornblende |
|
|
Sri Lanka |
Zeitschrift der Deutschen Gemmologischen
Gesellschaft, 1993, Dec, p166 |
44.74 |
14.81 |
18.74 |
1.94 |
0.28 |
12.18 |
2.39 |
|
|
2.44 |
1.87 |
Hornblende |
|
|
Sri Lanka |
Zeitschrift der Deutschen Gemmologischen
Gesellschaft, 1993, Dec, p166 |
43.91 |
14.61 |
18.79 |
1.73 |
0.21 |
12.27 |
2.39 |
|
|
2.49 |
1.91 |
Hornblende |
|
|
Sri Lanka |
Zeitschrift der Deutschen Gemmologischen
Gesellschaft, 1993, Dec, p166 |
45 |
14.71 |
18.51 |
1.92 |
0.22 |
11.96 |
2.37 |
|
|
2.44 |
1.49 |
Hornblende |
|
Baffin Island |
Canada |
The Journal of Gemmology 1986, 1986, Vol20, N°2 p102 |
45 |
14.1 |
20.1 |
0.62 |
0.73 |
12.1 |
3 |
0.1 |
0.11 |
1.3 |
1.4 |
Hornblende |
|
Baffin Island |
Canada |
The Journal of Gemmology 1986, 1986, Vol20, N°2 p102 |
43.8 |
14.7 |
19.3 |
1.3 |
0.45 |
12.7 |
2.3 |
0.08 |
|
1.6 |
1.6 |
Hornblende |
|
Baffin Island |
Canada |
The Journal of Gemmology 1986, 1986, Vol20, N°2 p102 |
46.5 |
11.7 |
20.7 |
0.31 |
1.1 |
12.1 |
3.4 |
|
|
0.5 |
1.1 |