Detailed sheet

jet

This is an organic material, a black variety of lignite containing 70% of carbon, resulting from the coalification of wood under anaerobic conditions (without oxygen) and under strong pressure, it is a fossil gem.
Its name comes from old French “jayet” or “jaiet” or the name of a city in Turkey, “Gages” and was called “stone of wages”. There is a thin stratum recalling lineage in the wood fibers, it is soft to the touch.
In England, at the death of Prince Albert in 1861, Queen Victoria wore the jet as a sign of mourning, throughout England they imitated her and thus favored the use of jet as a stone of mourning.
It is sometimes called “black amber” because it is a fossil material but is not amber.



CHEMICAL CHARACTERISTICS

C

carbon, lignite, fossil charcoal, coal



PHYSICAL CHARACTERISTICS

Main color

black

Other colors

brown

deep black, sometimes with hints of brown and even blue

Color of streak

brown, black

Luster

silky

Hardness

2.5 to 4.0

Density

1.20 to 1.35

Cleavage

none

Fracture

conchoidal



OPTICAL PROPERTIES

Transparency

opaque

Refractive index

1.640 - 1.690

Double refraction

0.000

none

visible double refraction

No

Pleochroism

absent

Number of colors

1

Fluorescence

none



CRYSTALS PROPERTIES

crystals system

amorphous



OTHER INFORMATIONS

Astrological sign

Aries, Libra, Taurus, Virgo



APPROACHING GEMS

Exploited
sites

It is found in England (Whitby, Yorkshire), Spain (Asturias, Aragon), United States (Colorado, Utah, New Mexico), Germany (Swabia, Saxony, Württemberg), Poland (often with inclusions of pyrite), Russia, France (Aude, Bouches-du-Rhone).

Other
Gems

Venez visitez

notre site web

voillot-joaillier.fr

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