Legrandite

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Physical & Optical Properties

Mohs Hardness 4.5 – 5.0
Specific Gravity 3.98 – 4.04
Refractive Index 1.702 – 1.74
Crystal System Monoclinic
Luster Vitreous
Cleavage Poor
Fracture Uneven
Color various
Birefringence 0.06
Pleochroism Yellow to colourless

Mohs Hardness

Mohs Hardness: 4.5 – 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 Legrandite

Legrandite is a rare zinc arsenate hydroxide mineral forming bright canary-yellow to orange-yellow crystals with an adamantine to vitreous luster in the oxidized zones of zinc ore deposits. It was first described from the Flor de Peña mine in Nuevo León, Mexico—still the primary source of spectacular collector crystals—with additional occurrences in Greece and the Democratic Republic of Congo. Well-crystallized legrandite specimens with vibrant color are highly sought by mineral collectors, and rare transparent material has been faceted.

Jewelry Use

Durability 3/10

Science FYI Family

Frequently Asked Questions

What is Legrandite?
Legrandite is a rare zinc arsenate hydroxide mineral forming bright canary-yellow to orange-yellow crystals with an adamantine to vitreous luster in the oxidized zones of zinc ore deposits. It was first described from the Flor de Peña mine in Nuevo León, Mexico—still the primary source of spectacula
What is the hardness of Legrandite?
Legrandite has a Mohs hardness of 4.5 to 5.0, making it relatively soft for use in jewelry.
What color is Legrandite?
Legrandite is primarily Various.
How much does Legrandite cost?
Legrandite falls into the Budget (< $50/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Legrandite?
Legrandite belongs to the Monoclinic crystal system.

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