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.

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.

Graftonite Market Value Calculator

Estimate the market value of Graftonite using size, quality, and finish. This preview calculator is for quick context and is not a formal appraisal.

Graftonite Localities Map

See where Graftonite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.

Map preview

North ZoneCentral RidgeSouth Basin

Quick Facts

Physical Properties

Color: Usually reddish brown, occasionally light brown, rarely salmon-pink; nearly colorless in transmitted light.
Hardness (Mohs): 5
Density: 3.95 g/cm³
Streak: White to faintly pink, when unaltered.