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 "T"
Gemstone |
Crystal
System |
Density |
Hardness |
Refractive
index |
Treatments |
Taaffeite
|
hexagonal |
3.61 |
8.0-8.5 |
1.719-.732 |
none known |
Thomsonite
|
aggregate |
2.35 |
5.0-5.5 |
1.515-1.540 |
none known |
Tanzanite
|
orthorhombic |
3.30 |
6.0-7.0 |
1.690-1.700 |
heat |
Tiger-eye
|
microcrystalline |
2.64-2.71 |
7.0 |
1.540-1.550 |
bleaching w/
honey tigereye |
Topaz
|
orthorhombic |
3.53 |
8.0 |
1.619-1.627 |
blue
is irradiated |
Tourmaline
|
trigonal |
3.06 |
7.0-7.5 |
1.624-1.644
(green) |
heat |
Tsavorite |
cubic |
3.84 |
6.5 - 7 |
1.73
- 1.75 |
none |
Tugtupite |
aggregate |
2.36 |
4.0-6.5 |
1.496-1.502 |
none |
Turquoise
|
triclinic |
2.73 |
5.0-6.0 |
1.610-1.650 |
dying,
sealing |