Boracite

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Physical & Optical Properties

Mohs Hardness 7.0 – 7.5
Specific Gravity 2.95 – 2.96
Refractive Index 1.658 – 1.673
Crystal System Orthorhombic
Cleavage Poor
Fracture Conchoidal
Color various
Birefringence 0.01
Pleochroism Nil

Mohs Hardness

Mohs Hardness: 7.0 – 7.5
1 Soft10 Hard

Crystal System

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

Value & Market

Price Tier Moderate ($50-500/ct)

About Boracite

Boracite is a magnesium borate mineral forming small, sharp, pseudo-cubic crystals typically in colorless, white, or pale green to blue-green tones within evaporite deposits. Notably, boracite is pyroelectric and piezoelectric, and its crystals transform from cubic to orthorhombic symmetry below 265°C. Rare transparent specimens from Stassfurt, Germany, and Otis, Louisiana are occasionally faceted as curiosity collector gems.

Jewelry Use

Durability 7/10

Suitable for daily wear

Science FYI Family

Frequently Asked Questions

What is Boracite?
Boracite is a magnesium borate mineral forming small, sharp, pseudo-cubic crystals typically in colorless, white, or pale green to blue-green tones within evaporite deposits. Notably, boracite is pyroelectric and piezoelectric, and its crystals transform from cubic to orthorhombic symmetry below 265
What is the hardness of Boracite?
Boracite has a Mohs hardness of 7.0 to 7.5, making it excellent for use in jewelry.
What color is Boracite?
Boracite is primarily Various.
How much does Boracite cost?
Boracite falls into the Moderate ($50-500/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Boracite?
Boracite belongs to the Orthorhombic crystal system.

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