Eskolaite
A variety of Hematite Group
What is Eskolaite?
Eskolaite is a rare chromium oxide mineral (chromium(III) oxide Cr2O3).
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Eskolaite 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.
Eskolaite Localities Map
See where Eskolaite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Key Characteristics
Formation of Eskolaite
It was first described in 1958 for an occurrence in the Outokumpu ore deposit of eastern Finland. It occurs in chromium bearing tremolite skarns, metamorphosed quartzites and chlorite bearing veins in Finland; in glacial boulder clays in Ireland and in stream pebbles in the Merume River of Guyana. It has also been recognized as a rare component in chondrite meteorites. The mineral is named after the Finnish geologist Pentti Eskola (1883–1964).
Quick Facts
Physical Properties
- Color
- Black
- Hardness (Mohs)
- 8 - 8.5
- Density
- 5.2 g/cm³
- Streak
- Green
Chemical Properties
- Chemical Formula
- Cr2O3
- Elements
- Cr, O
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Eskolaite FAQs
How do I identify Eskolaite?
Eskolaite can be identified by its hardness of 8 - 8.5 on the Mohs scale, Black color. Look for these key characteristics when examining specimens.
What color is Eskolaite?
Eskolaite typically appears in Black. Color can vary depending on impurities and formation conditions.
How hard is Eskolaite?
Eskolaite has a hardness of 8 - 8.5 on the Mohs scale. This makes it a relatively hard mineral suitable for jewelry.
What is the formation of eskolaite of Eskolaite?
It was first described in 1958 for an occurrence in the Outokumpu ore deposit of eastern Finland. It occurs in chromium bearing tremolite skarns, metamorphosed quartzites and chlorite bearing veins in Finland; in glacial boulder clays in Ireland and in stream pebbles in the Merume River of Guyana. It has also been recognized as a rare component in chondrite meteorites. The mineral is named after the Finnish geologist Pentti Eskola (1883–1964).