Mellite

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Physical & Optical Properties

Category Organic Gems
Mohs Hardness 2.0
Specific Gravity 1.58 – 1.6
Refractive Index 1.509 – 1.541
Crystal System Tetragonal
Luster Vitreous,Resinous
Cleavage Indistinct
Fracture Conchoidal
Color various
Birefringence 0.03
Pleochroism Weak: yellowish brown - yellow

Mohs Hardness

Mohs Hardness: 2.0
1 Soft10 Hard

Crystal System

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

Value & Market

Price Tier Budget (< $50/ct)

Where to Buy Mellite

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About Mellite

Mellite, also known as honeystone, is a unique hydrated aluminum benzene hexacarboxylate mineral—one of the very few organic gem minerals—forming transparent to translucent honey-yellow to orange-brown octahedral crystals with a resinous luster and low hardness (Mohs 2–2.5). It forms in brown coal (lignite) deposits and was first described from Thuringia, Germany, with additional occurrences in the Czech Republic and Hungary. The unusual organic composition and attractive amber-honey color make faceted mellite a remarkable collector gem.

Jewelry Use

Durability 1/10

Science FYI Family

Frequently Asked Questions

What is Mellite?
Mellite, also known as honeystone, is a unique hydrated aluminum benzene hexacarboxylate mineral—one of the very few organic gem minerals—forming transparent to translucent honey-yellow to orange-brown octahedral crystals with a resinous luster and low hardness (Mohs 2–2.5). It forms in brown coal (
What is the hardness of Mellite?
Mellite has a Mohs hardness of 2.0, making it relatively soft for use in jewelry.
What color is Mellite?
Mellite is primarily Various.
How much does Mellite cost?
Mellite falls into the Budget (< $50/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Mellite?
Mellite belongs to the Tetragonal crystal system.

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