Triplite

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Physical & Optical Properties

Mohs Hardness 5,0 – 5,5
Specific Gravity 3,85 – 3,94
Refractive Index 1,643 – 1,703
Crystal System Monoclinic
Fracture Sub-Conchoidal
Color various
Birefringence 0,02
Pleochroism Distinct

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 Triplite

Triplite is a dark reddish-brown to black manganese iron phosphate mineral with a resinous to vitreous luster, forming massive to prismatic crystals in granitic pegmatites and phosphate-rich rocks. It is found in classical mineral localities including Greifenstein, Germany, and various pegmatites in Brazil, Sweden, and the United States, and is occasionally faceted into reddish-brown collector gems. Its name derives from the Greek for threefold, referencing its three distinct cleavage directions.

Jewelry Use

Durability 4/10

Science FYI Family

Frequently Asked Questions

What is Triplite?
Triplite is a dark reddish-brown to black manganese iron phosphate mineral with a resinous to vitreous luster, forming massive to prismatic crystals in granitic pegmatites and phosphate-rich rocks. It is found in classical mineral localities including Greifenstein, Germany, and various pegmatites in
What is the hardness of Triplite?
Triplite has a Mohs hardness of 5.0 to 5.5, making it moderate for use in jewelry.
What color is Triplite?
Triplite is primarily Various.
How much does Triplite cost?
Triplite falls into the Budget (< $50/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Triplite?
Triplite belongs to the Monoclinic crystal system.

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