Alphabetical
Gemstone List
Click
on a letter for a list of gems:
A| B| C| D| E| F| G| H| I| J| K| L| M| N| O| P| Q| R| S| T|U| V| W| X|Y |Z
Gemstones that begin
with the letter "S"
| Gemstone |
Crystal
System |
Density |
Hardness |
Refractive
index |
Treatments |
Sapphire
|
hexagonal |
4.00 |
9 |
1.762-1.770 |
heat, fracture filling |
Saussurite
|
aggregate |
3.30 |
6.5-7.0 |
spot:1.70 and 1.56 |
heat, fracture filling |
Scapolite
|
tetragonal |
2.60 |
6.0-6.5 |
1.550-1.564 |
irradiation |
Scheelite
|
tetragonal |
2.60 |
6.0-6.5 |
1.550-1.564 |
irradiation |
Serpentine
|
aggregate |
2.57 |
2.5 to 6.0 |
1.560-1.570 |
dying, wax impregnation |
Sillimanite
|
orthorhombic |
3.25 |
6.0-7.5 |
1.659-1.680 |
none known |
Sinhalite
|
orthorhombic |
3.48 |
6.5-7.0 |
1.668-1.707 |
none known |
Smithsonite
|
trigonal |
4.30 |
4.0-6.0 |
1.621-1.849 |
none known |
Smoky
Quartz
|
hexagonal |
2.66 |
7.0 |
1.544-1.553 |
none known |
Sodalite
|
cubic |
2.25 |
5.0-6.0 |
1.483 |
none known |
Sphalerite
|
cubic |
4.05 |
3.5-4.0 |
2.369-2.50 (increases with Fe content) |
none known |
Sphene
|
monoclinic |
3.52 |
5.0-5.5 |
1.900-2.034 |
none known |
Spinel
|
cubic |
3.60 |
8 |
1.718 |
none known |
Spodumene
|
monoclinic |
3.18 |
6.5-7.0 |
1.660-1.676 |
irradiation |
Sugilite
|
monoclinic |
2.74 |
5.5-6.5 |
1.6071.610 |
non known |
