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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.
History & Geography
Explore the main themes, entities and connections around Jet (gemstone). Start with the topic map, then use the sections below for research and deeper semantic analysis.
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| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Jet (gemstone) | Category | Mineraloid | 1.00 | infobox |
| Jet (gemstone) | Cleavage | None | 1.00 | infobox |
| Jet (gemstone) | Color | Black, occasionally brown | 1.00 | infobox |
| Jet (gemstone) | Common impurities | Iron, sulfur | 1.00 | infobox |
| Jet (gemstone) | Dispersion | None; opaque | 1.00 | infobox |
| Jet (gemstone) | Formula | Variable, but rich in carbon | 1.00 | infobox |
| Jet (gemstone) | Fracture | Conchoidal | 1.00 | infobox |
| Jet (gemstone) | Mohs scale hardness | 2.5–4.0 | 1.00 | infobox |
| Jet (gemstone) | Optical properties | Isotropic | 1.00 | infobox |
| Jet (gemstone) | References | [citation needed] | 1.00 | infobox |
| Jet (gemstone) | Refractive index | 1.640–1.680 | 1.00 | infobox |
| Jet (gemstone) | Specific gravity | 1.3–1.4 | 1.00 | infobox |
| Jet (gemstone) | Streak | Brown | 1.00 | infobox |
| Jet (gemstone) | Tenacity | Brittle | 1.00 | infobox |
| Jet (gemstone) | Ultraviolet fluorescence | None | 1.00 | infobox |
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