Gemstones
6 results
Mineral
Amethyst
- Formula
- SiO2
- Mohs
- 7
- Colour
- Purple
Gemstone
Emerald
- Formula
- Be3Al2Si6O18
- Mohs
- 7.5–8
- Colour
- Green
Mineral
Heliodor
heliodor
- Formula
- Be3Al2Si6O18
- Mohs
- 7.5–8
- Colour
- Yellow to greenish-yellow
Gemstone
Ruby
- Formula
- Al2O3
- Mohs
- 9
- Colour
- Red
Gemstone
Sapphire
- Formula
- Al2O3
- Mohs
- 9
- Colour
- Blue and other non-red colours
Gemstone
Turquoise
- Formula
- CuAl6(PO4)4(OH)8·4H2O
- Mohs
- 5–6
- Colour
- Blue to green