Hodgkinsonite
A variety of Minerals
What is Hodgkinsonite?
Hodgkinsonite is a rare zinc manganese silicate mineral Zn2MnSiO4(OH)2. It crystallizes in the monoclinic system and typically forms radiating to acicular prismatic crystals with variable color from pink, yellow-red to deep red. Hodgkinsonite was discovered in 1913 by H. H. Hodgkinson, for whom it is named in Franklin, New Jersey, and it is only found in that area.
Optical Properties
- Refractive Index
- 1.720-1.746
- Birefringence
- 0.026
- Pleochroism
- Transparent pink stones: lavender and pale purple
- Optical Character
- Biaxial negative
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Hodgkinsonite before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Hodgkinsonite Localities Map
See where Hodgkinsonite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Bright pink, red to reddish brown, orange, yellow, black
- Hardness (Mohs)
- 4.5 - 5
- Streak
- White
Chemical Properties
- Chemical Formula
- Mn2+Zn2(SiO4)(OH)2
- Elements
- H, Mn, O, Si, Zn
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Hodgkinsonite FAQs
How do I identify Hodgkinsonite?
Hodgkinsonite can be identified by its hardness of 4.5 - 5 on the Mohs scale, Bright pink color. Look for these key characteristics when examining specimens.
What color is Hodgkinsonite?
Hodgkinsonite typically appears in Bright pink, red to reddish brown, orange, yellow, black. Color can vary depending on impurities and formation conditions.
How hard is Hodgkinsonite?
Hodgkinsonite has a hardness of 4.5 - 5 on the Mohs scale. This gives it moderate hardness.
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