Hübnerite

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Physical & Optical Properties

Mohs Hardness 4.0 – 4.5
Specific Gravity 7.12 – 7.18
Refractive Index 2.17 – 2.32
Crystal System Monoclinic
Cleavage Perfect
Fracture Uneven
Color various
Birefringence 0.13
Pleochroism Perceptible: yellow to green, red-orange - yellowish brown to greenish yellow, red-orange to red - green; brick-red to red

Mohs Hardness

Mohs Hardness: 4.0 – 4.5
1 Soft10 Hard

Crystal System

β a b c Monoclinic a ≠ b ≠ c, α = γ = 90°, β ≠ 90°

Value & Market

Price Tier Budget (< $50/ct)

About Hübnerite

Hübnerite is the manganese-rich end-member of the wolframite mineral series, forming dark reddish-brown to brownish-black prismatic crystals with a submetallic to resinous luster and distinctive reddish hue in transmitted light. It occurs in high-temperature hydrothermal veins and granitic pegmatites, with notable localities in Peru, Colorado (USA), Spain, and China. Rare transparent red-brown crystals are occasionally faceted for collectors, producing unusual deep auburn gems with high refractive index.

Jewelry Use

Durability 3/10

Science FYI Family

Frequently Asked Questions

What is Hübnerite?
Hübnerite is the manganese-rich end-member of the wolframite mineral series, forming dark reddish-brown to brownish-black prismatic crystals with a submetallic to resinous luster and distinctive reddish hue in transmitted light. It occurs in high-temperature hydrothermal veins and granitic pegmatite
What is the hardness of Hübnerite?
Hübnerite has a Mohs hardness of 4.0 to 4.5, making it relatively soft for use in jewelry.
What color is Hübnerite?
Hübnerite is primarily Various.
How much does Hübnerite cost?
Hübnerite falls into the Budget (< $50/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Hübnerite?
Hübnerite belongs to the Monoclinic crystal system.

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