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Jet

Jet

By Tim Matthews, JD, FGA, GG, DGA,
CEO and President of JTV (retired)
Published: June 2014
Modified: November 2021
Jet Polished Jet Rough Jet Jewelry
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Table of Contents
  • General Information
  • Jet Colors
  • Alternate Names
  • Countries of Origin
  • History
  • Care
  • Species/Variety
  • Related Videos

Jet is generally classified as a lignite coal and has a high carbon content and a layered structure. It is typically black to dark brown and can sometimes contain tiny inclusions of pyrite. Jet has been carved for ornamental purposes since prehistoric times. The term “jet black” gets its name from the color of jet. There is hard jet that forms in saltwater and soft jet that forms in freshwater.

General Information

  • Classification
  • Optical Properties
  • Characteristic Physical Properties
  • Chemistry & Crystallography
Common Name
Jet
Species
Jet
Transparency
Semitranslucent - Opaque
Dispersion
Strength: None
Refractive Index
1.660
Tolerance:(+0.020/-0.020)
Optic Character
NA
Polariscope Reaction
Singly Refractive (SR)
Fluorescence
SWUV: inert
LWUV: inert
Pleochroism
None
Hardness
2-4
Streak
Black-Brown
Specific Gravity
1.120-1.520 Typical:1.320
Toughness
Poor
Inclusions
In some Jet specimens the original wood structure can be seen.
Luster
Vitreous, Resinous, Waxy
Fracture
Conchoidal, uneven
Cleavage
None
Chemical Name
hydrated hydro carbon
Chemical Formula
CHO-2H2O
Crystal System
NA
Chemistry Classification
Organic

Jet Colors

  • Black Jet
    Black
  • Brown Jet
    Brown

Alternate Names

Whitby Jet

Countries of Origin

Russian Federation; Cambodia; United States of America; United Kingdom of Great Britain and Northern Ireland; Portugal; Spain; Canada; Austria; Mongolia; Turkey; Unknown; Luxembourg; Poland; Italy; France; Germany

History

It has been proposed that jet is formed from driftwood that has been carbonized and subjected to heat and pressure over millions of years. Bronze age the first jet artifacts have been found at archaeological sites.

Care

Hard jet needs normal care and handling, more care needs to be taken with soft jet.

Species/Variety

Whitby Jet

Whitby Jet is found in the cliffs of Whitby a seaside town in the Scarborough district of North Yorkshire, England. It is known for its high luster and jet-black color. It was favored after the death of Prince Albert when it was used by Queen Victoria as morning jewelry.

  • Classification
  • Optical Properties
  • Characteristic Physical properties
Common Name
Whitby Jet
Fluorescence
Inert
Toughness
Poor
Inclusions
Rarely contains quartz grains, might show tree like structure under magnification

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