Friedelite

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Physical & Optical Properties

Mohs Hardness 4,0 – 5,0
Specific Gravity 3,06 – 3,19
Refractive Index 1,627 – 1,663
Crystal System Monoclinic
Luster Vitreous
Cleavage Perfect
Fracture Uneven
Color various
Birefringence 0,032
Pleochroism Nil

Mohs Hardness

Mohs Hardness: 4,0 – 5,0
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 Friedelite

Friedelite is a manganese silicate hydroxide mineral occurring as dark rose-red to brownish-red tabular crystals with a vitreous to resinous luster. It was first described from the Benalite mine in Hérault, France, and also occurs notably at the Franklin zinc deposit in New Jersey, USA. While typically opaque, rare translucent material has been cut en cabochon, exhibiting a soft pinkish-red color valued by collectors.

Jewelry Use

Durability 3/10

Science FYI Family

Frequently Asked Questions

What is Friedelite?
Friedelite is a manganese silicate hydroxide mineral occurring as dark rose-red to brownish-red tabular crystals with a vitreous to resinous luster. It was first described from the Benalite mine in Hérault, France, and also occurs notably at the Franklin zinc deposit in New Jersey, USA. While typica
What is the hardness of Friedelite?
Friedelite has a Mohs hardness of 4.0 to 5.0, making it relatively soft for use in jewelry.
What color is Friedelite?
Friedelite is primarily Various.
How much does Friedelite cost?
Friedelite falls into the Budget (< $50/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Friedelite?
Friedelite belongs to the Monoclinic crystal system.

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