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Jet
Jet is fossilized wood (lignite), C (lignitic carbon). In the hand, it rates 2.5 to 4 on the Mohs scale, and it runs deep velvety black. Featherweight, warm-to-touch deep black material that leaves a chocolate-brown streak on unglazed porcelain. Notable: Whitby (England), Asturias (Spain), Georgia (USA), Turkey.
The geology.
Jet carries the formula C (lignitic carbon). It belongs to the amorphous system. On paper it is fossilized wood (lignite).
It sits at 2.5 to 4 on the Mohs scale. The surface reads velvety waxy. Light behaviour is opaque. Specific gravity runs 1.30 to 1.34. The streak is brown (key test). It breaks with conchoidal fracture.
Featherweight, warm-to-touch deep black material that leaves a chocolate-brown streak on unglazed porcelain.
Expect to see it as beads, cabochons, carvings or rough nodules.
The origins.
Notable: Whitby (England), Asturias (Spain), Georgia (USA), Turkey.
On value, the database notes: mid-range; genuine Whitby material is prized.
Traditional associations.
In energy work traditions, associated with protection and mourning support.
Recorded here because it is part of how this material is sold, not because it is a property of the material.
Spotting the real thing.
Featherweight, warm-to-touch deep black material that leaves a chocolate-brown streak on unglazed porcelain.
Victorian-era 'French jet' (black glass) and modern resin imitations abound, weight and streak settle it.
| Looks like | How to tell them apart |
|---|---|
| Black onyx | Onyx is cold, heavy, and streaks white |
| Black obsidian | Obsidian is glassy-cold with smoky translucent edges |
| Black glass ('French jet') | Glass is cold and dense; jet is warm and light |
| Shungite | Shungite conducts electricity; jet does not |
At-home tests.
None of these need a lab. A 10x loupe, good daylight and a steady hand cover most of what a buyer needs to know about jet.
| Test | What you should see |
|---|---|
| By eye | Brown streak on porcelain |
| By weight | Remarkably lightweight (SG 1.3) |
| By touch | Warms quickly in hand; develops static when rubbed |
Anything that scratches, burns or dissolves the piece is a lab job. Get it appraised rather than testing it apart.
Care & handling.
At 2.5 to 4 on the Mohs scale this is a soft material. Keep it as a display piece, store it apart from harder stones, and skip daily-wear settings.
It breaks with conchoidal fracture, which is worth knowing before you set it or drop it.
Warm water and a soft cloth clean almost everything. Ultrasonic tanks, steamers and household cleaners are where pieces get ruined.
A deeper look.
Extended detail on composition, sourcing, authentication and market value.
The physical record
The formula on record is C (lignitic carbon). Crystal system: Amorphous. Specific gravity: 1.30 to 1.34. Streak: Brown (key test). Cleavage and fracture: Conchoidal fracture.
How it reaches the market
Notable: Whitby (England), Asturias (Spain), Georgia (USA), Turkey.
What it gets confused with
Black onyx: Onyx is cold, heavy, and streaks white. Black obsidian: Obsidian is glassy-cold with smoky translucent edges. Black glass ('French jet'): Glass is cold and dense; jet is warm and light. Shungite: Shungite conducts electricity; jet does not.
What it is worth
Mid-range; genuine Whitby material is prized.
Where buyers get caught
Victorian-era 'French jet' (black glass) and modern resin imitations abound, weight and streak settle it.
One more thing
Jet is ancient driftwood, waterlogged araucaria trees compressed into gem coal over 180 million years.
An education-first guide.
No product links here. We do not sell jet, and a guide that only covers our own shelves would not be much of a guide.
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