Herderite

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Physical & Optical Properties

Mohs Hardness 5,0 – 5,5
Specific Gravity 2,9 – 3,02
Refractive Index 1,587 – 1,642
Crystal System Monoclinic
Luster Vitreous
Cleavage Indistinct
Fracture Sub-Conchoidal
Color various
Birefringence 0,028

Mohs Hardness

Mohs Hardness: 5,0 – 5,5
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 Herderite

Herderite is a rare calcium beryllium phosphate fluoride mineral occurring in colorless, pale yellow, greenish, or lilac tones with a vitreous luster and good hardness (Mohs 5–5.5). It forms in granitic pegmatites and is found in notable localities in Brazil, Maine (USA), Afghanistan, and Germany, named after Saxon mineralogist and mining official S.A.W. von Herder. Faceted herderite gems are prized by phosphate mineral collectors for their clarity and the attractive color range of the beryllium-phosphate series.

Jewelry Use

Durability 4/10

Science FYI Family

Frequently Asked Questions

What is Herderite?
Herderite is a rare calcium beryllium phosphate fluoride mineral occurring in colorless, pale yellow, greenish, or lilac tones with a vitreous luster and good hardness (Mohs 5–5.5). It forms in granitic pegmatites and is found in notable localities in Brazil, Maine (USA), Afghanistan, and Germany, n
What is the hardness of Herderite?
Herderite has a Mohs hardness of 5.0 to 5.5, making it moderate for use in jewelry.
What color is Herderite?
Herderite is primarily Various.
How much does Herderite cost?
Herderite falls into the Budget (< $50/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Herderite?
Herderite belongs to the Monoclinic crystal system.

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