Greenalite
A variety of Minerals
What is Greenalite?
Greenalite is a mineral in the kaolinite-serpentine group with the chemical composition (Fe,Fe)2-3Si2O5OH4. It is a member of the serpentine group.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Greenalite 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.
Greenalite Localities Map
See where Greenalite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Key Characteristics
Formation of Greenalite
Greenalite was first described in 1903 for an occurrence in the Mesabi Range near Biwabik, St. Louis County, Minnesota and named for its green color. Greenalite occurs as a primary phase in banded iron formations. Rocks which contain greenalite are usually bright green, pale green or pale brown. Greenalite occurs with quartz, stilpnomelane, siderite, chamosite, pyrite and minnesotaite. It is commonly oolitic.
Quick Facts
Physical Properties
- Color
- green, light yellow-green
- Hardness (Mohs)
- 2.5
- Streak
- greenish-gray
Chemical Properties
- Chemical Formula
- (Fe2+,Fe3+)2-3Si2O5(OH)4
- Elements
- Fe, H, O, Si
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Greenalite FAQs
How do I identify Greenalite?
Greenalite can be identified by its hardness of 2.5 on the Mohs scale, green color. Look for these key characteristics when examining specimens.
What color is Greenalite?
Greenalite typically appears in green, light yellow-green. Color can vary depending on impurities and formation conditions.
How hard is Greenalite?
Greenalite has a hardness of 2.5 on the Mohs scale. This makes it a soft mineral that can be scratched easily.
What is the formation of greenalite of Greenalite?
Greenalite was first described in 1903 for an occurrence in the Mesabi Range near Biwabik, St. Louis County, Minnesota and named for its green color. Greenalite occurs as a primary phase in banded iron formations. Rocks which contain greenalite are usually bright green, pale green or pale brown. Greenalite occurs with quartz, stilpnomelane, siderite, chamosite, pyrite and minnesotaite. It is commonly oolitic.
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