Norbergite
A variety of Minerals
What is Norbergite?
Norbergite is a nesosilicate mineral with formula Mg3(SiO4)(F,OH)2. It is a member of the humite group. It was first described in 1926 for an occurrence in the Östanmoss iron mine in Norberg, Västmanland, Sweden, for which it is named. It occurs in contact metamorphic zones in carbonate rocks intruded by plutonic rocks or pegmatites supplying the fluorine. Associated minerals include dolomite, calcite, tremolite, grossular, wollastonite, forsterite, monticellite, cuspidine, fluoborite, ludwigite, fluorite and phlogopite.
Optical Properties
- Refractive Index
- 1.563-1.593
- Pleochroism
- Pale yellow, very pale yellow, colorless
- Optical Character
- Biaxial positive
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Norbergite 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.
Norbergite Localities Map
See where Norbergite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Quick Facts
Physical Properties
- Color
- Orange-yellow, yellow, orange to brown
- Hardness (Mohs)
- 6 - 6.5
- Density
- 3.186 g/cm³
- Streak
- White
Chemical Properties
- Chemical Formula
- Mg3(SiO4)(F,OH)2
- Elements
- F, H, Mg, O, Si
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Norbergite FAQs
How do I identify Norbergite?
Norbergite can be identified by its hardness of 6 - 6.5 on the Mohs scale, Orange-yellow color. Look for these key characteristics when examining specimens.
What color is Norbergite?
Norbergite typically appears in Orange-yellow, yellow, orange to brown. Color can vary depending on impurities and formation conditions.
How hard is Norbergite?
Norbergite has a hardness of 6 - 6.5 on the Mohs scale. This gives it moderate hardness.
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