Montebrasite

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Physical & Optical Properties

Mohs Hardness 5.5 – 6.0
Specific Gravity 2.98 – 3.1
Refractive Index 1.578 – 1.646
Crystal System Triclinic
Luster Vitreous
Cleavage Perfect
Fracture Uneven,Sub-Conchoidal
Color various
Birefringence 0.02

Mohs Hardness

Mohs Hardness: 5.5 – 6.0
1 Soft10 Hard

Crystal System

a b c Triclinic a ≠ b ≠ c, α ≠ β ≠ γ ≠ 90°

Value & Market

Price Tier Budget (< $50/ct)

About Montebrasite

Montebrasite is a lithium aluminum phosphate hydroxide mineral, the hydroxyl-dominant analogue of amblygonite, typically forming colorless, white, pale yellow, or pale green prismatic crystals with a vitreous to pearly luster in granitic pegmatites. It was first described from Montebras in Creuse, France, and occurs in phosphate-rich pegmatites in Brazil, Portugal, and Sweden. Transparent faceted montebrasite is a rare collector gem prized for its clarity in the lithium phosphate mineral series.

Jewelry Use

Durability 4/10

Science FYI Family

Frequently Asked Questions

What is Montebrasite?
Montebrasite is a lithium aluminum phosphate hydroxide mineral, the hydroxyl-dominant analogue of amblygonite, typically forming colorless, white, pale yellow, or pale green prismatic crystals with a vitreous to pearly luster in granitic pegmatites. It was first described from Montebras in Creuse, F
What is the hardness of Montebrasite?
Montebrasite has a Mohs hardness of 5.5 to 6.0, making it moderate for use in jewelry.
What color is Montebrasite?
Montebrasite is primarily Various.
How much does Montebrasite cost?
Montebrasite falls into the Budget (< $50/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Montebrasite?
Montebrasite belongs to the Triclinic crystal system.

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