Jet
Real mineral · uncommon · C (compact lignite)
A form of lignite coal derived from fossilised driftwood buried in marine sediments. Harder and denser than ordinary coal. Carved into jewellery for thousands of years; the Whitby variety was fashionable in Victorian mourning jewellery.
Identity
- Formula
- C (compact lignite)
- Chemical class
- organic
- Also known as
- Black amber (informal), Whitby jet (locality name)
Crystallography
- Crystal system
- amorphous
- Habits
- massive
- Fracture
- conchoidal
Physical properties
- Mohs hardness
- 2.5
- Density
- 1.32 g/cm³
- Luster
- waxy, dull
- Colors
- black, brownish-black
- Streak
- brown
- Transparency
- opaque
Geology
- Origins
- sedimentary
- Host rocks
- shale, mudstone
- Geography
- UK (Whitby), Spain (Asturias), USA, Germany
Classification
- Rarity
- uncommon
- Gem quality
- Yes
Arcane properties
- Affinity
- death, shadow
- Effects
- necromancy, warding
- Planar origin
- Material Plane
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