Jet
| Colour | Black, Brown |
|---|---|
| Mohs hardness | 2.5–4.0 |
| Streak | Brown |
| Cleavage | None |
| Fracture | Conchoidal |
| Chemical formula | Variable, but rich in carbon |
| Specific gravity | 1.3–1.4 |
What is Jet?
Jet is a type of lignite, the lowest rank of coal, and is a gemstone. Unlike many gemstones, jet is not a mineral, but is rather a mineraloid. It is derived from wood that has changed under extreme pressure.
How to identify Jet
- Hardness: Mohs 2.5–4.0 — soft; a knife will scratch it.
- Streak: Brown.
Jet in different forms
Stones often confused with Jet
Frequently asked questions
How hard is Jet?
Jet is Mohs 2.5–4.0 on the hardness scale.
What colour is Jet?
Jet is typically black, brown (Black, occasionally brown).