Jet
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Physical & Optical Properties
Category
Organic Gems
Mohs Hardness
2.5 – 4.0
Specific Gravity
1.19 – 1.35
Refractive Index
1.64 – 1.68
Crystal System
Amorphous
Luster
Waxy,Dull
Cleavage
None
Fracture
Conchoidal
Color
various
Pleochroism
Absent
Mohs Hardness
| Mohs | Reference mineral | Jet |
|---|---|---|
| 1 | Talc | |
| 2 | Gypsum | |
| 3 | Calcite | ● |
| 4 | Fluorite | ● |
| 5 | Apatite | |
| 6 | Orthoclase | |
| 7 | Quartz | |
| 8 | Topaz | |
| 9 | Corundum | |
| 10 | Diamond |
Crystal System
Value & Market
Price Tier
Budget (< $50/ct)
Where to Buy Jet
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About Jet
ジェット（黒玉）は、炭化した木材が化石化した有機質鉱物で、深い黒色と軽い重量が特徴です。英国のヨーク州ウィットビーが最も有名な産地で、ビクトリア女王の喪の宝石として19世紀に大流行しました。磨くと美しい光沢が現れ、彫刻品や装飾品として使用されます。
On this page
Jewelry Use
Durability
1/10
Science FYI Family
Frequently Asked Questions
What is Jet?
ジェット（黒玉）は、炭化した木材が化石化した有機質鉱物で、深い黒色と軽い重量が特徴です。英国のヨーク州ウィットビーが最も有名な産地で、ビクトリア女王の喪の宝石として19世紀に大流行しました。磨くと美しい光沢が現れ、彫刻品や装飾品として使用されます。
What is the hardness of Jet?
Jet has a Mohs hardness of 2.5 to 4.0, making it relatively soft for use in jewelry.
What color is Jet?
Jet is primarily Various.
How much does Jet cost?
Jet falls into the Budget (< $50/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Jet?
Jet belongs to the Amorphous crystal system.