Franklinite
A variety of Spinel Subgroup
What is Franklinite?
Franklinite is named after Franklin, New Jersey which is where it was discovered. This mineral is geographically limited to Franklin and neighboring Ogdensburg. This mineral is used as an ore of zinc and manganese, which are two important industrial metals. Specimens of this rare mineral are highly valued by mineral collectors.
Uses & Applications
Franklinite is an ore of zinc, a material used industrially to galvanize steel and other metals, to produce alloys and die-castings, and to make a variety of products including paint, rubber, pharmaceuticals, plastics, batteries, and electronics. Franklinite has also been known to be an ore of small amounts of uranium, sulfuric acid, and mercury.
Healing Properties
If you're losing your hair, franklinite supposedly encourages hair growth. This stone is also believed to be beneficial for male reproductive difficulties and to heal eye disorders. Franklinite is said to connect with the base chakra, having a grounding effect on the possessor, and the stone's vibration is believed to stimulate self-expression and bring about novel ideas.
Optical Properties
- Optical Character
- Isotropic
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Franklinite 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.
Franklinite Localities Map
See where Franklinite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
The Meaning
Franklinite is New Jersey's official state mineral.
Associated Chakras
More Images
Quick Facts
Physical Properties
- Color
- Black
- Hardness (Mohs)
- 5.5 - 6
- Density
- 5.163 g/cm³
- Streak
- Reddish brown to black
- Luster
- Metallic, Sub-metallic
- Crystal System
- Isometric
Chemical Properties
- Chemical Formula
- Zn2+Fe3+2O4
- Elements
- Fe, O, Zn
Also Known As
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Franklinite FAQs
How do I identify Franklinite?
Franklinite can be identified by its hardness of 5.5 - 6 on the Mohs scale, Black color, Metallic, Sub-metallic luster, Isometric crystal system. Look for these key characteristics when examining specimens.
What color is Franklinite?
Franklinite typically appears in Black. Color can vary depending on impurities and formation conditions.
How hard is Franklinite?
Franklinite has a hardness of 5.5 - 6 on the Mohs scale. This gives it moderate hardness.
