Hodgkinsonite

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Physical & Optical Properties

Mohs Hardness 4.5 – 5.0
Specific Gravity 4.06 – 4.08
Refractive Index 1.72 – 1.746
Crystal System Monoclinic
Luster Vitreous
Cleavage Perfect
Fracture Uneven
Color various
Birefringence 0.026
Pleochroism Lavender and pale purple for transparent pink stones.

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 Hodgkinsonite

Hodgkinsonite is a rare zinc manganese silicate hydroxide mineral occurring as translucent to transparent pink to red prismatic crystals with a vitreous to adamantine luster. It is primarily known from the Franklin zinc deposit in New Jersey, USA—one of the world's most mineralogically rich localities—where it was named after H.H. Hodgkinson, a mining company official. Under ultraviolet light, hodgkinsonite produces a striking orange fluorescence, adding to its appeal as a Franklin mineral collector's specimen.

Jewelry Use

Durability 3/10

Science FYI Family

Frequently Asked Questions

What is Hodgkinsonite?
Hodgkinsonite is a rare zinc manganese silicate hydroxide mineral occurring as translucent to transparent pink to red prismatic crystals with a vitreous to adamantine luster. It is primarily known from the Franklin zinc deposit in New Jersey, USA—one of the world's most mineralogically rich localiti
What is the hardness of Hodgkinsonite?
Hodgkinsonite has a Mohs hardness of 4.5 to 5.0, making it relatively soft for use in jewelry.
What color is Hodgkinsonite?
Hodgkinsonite is primarily Various.
How much does Hodgkinsonite cost?
Hodgkinsonite falls into the Budget (< $50/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Hodgkinsonite?
Hodgkinsonite belongs to the Monoclinic crystal system.

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