Graftonite
A variety of Minerals
What is Graftonite?
Graftonite is an iron(II), manganese, calcium phosphate mineral with the chemical formula (Fe2+,Mn,Ca)3(PO4)2. It forms lamellar to granular translucent brown to red-brown to pink monoclinic prismatic crystals. It has a vitreous luster with a Mohs hardness of 5 and a specific gravity of 3.67 to 3.7. It was first described from its type locality of Melvin Mountain in the town of Grafton, in Grafton County, New Hampshire.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Graftonite 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.
Quick Facts
Physical Properties
- Color
- Usually reddish brown, occasionally light brown, rarely salmon-pink; nearly colorless in transmitted light.
- Hardness (Mohs)
- 5
- Rock tumbling
- With care
- Density
- 3.95 g/cm³
- Streak
- White to faintly pink, when unaltered.
Chemical Properties
- Chemical Formula
- Fe2+Fe2+2(PO4)2
- Elements
- Fe, O, P
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Graftonite FAQs
How do I identify Graftonite?
Graftonite can be identified by its hardness of 5 on the Mohs scale, Usually reddish brown color. Look for these key characteristics when examining specimens.
What color is Graftonite?
Graftonite typically appears in Usually reddish brown, occasionally light brown, rarely salmon-pink; nearly colorless in transmitted light.. Color can vary depending on impurities and formation conditions.
How hard is Graftonite?
Graftonite has a hardness of 5 on the Mohs scale. This gives it moderate hardness.
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