Esseneite
A variety of Clinopyroxene Subgroup
What is Esseneite?
Esseneite is a relative rare mineral of the pyroxene group, with formula CaFeAlSiO6. It is the ferric-iron-dominant member. Esseneite is an iron-analogue of other pyroxene-group members, davisite, grossmanite, and kushiroite. It is a metamorphic mineral forming in pyrometamorphic rocks called paralavas, which are formed due to fusing on sedimentary rocks usually in result of coal fires. Esseneite is found in both natural and anthropogenic coal-fire sites. Esseneite was named for Eric J. Essene (1939-2011), a metamorphic petrologist and Professor of Geosciences at the University of Michigan. The mineral crystallizes in the monoclinic crystal system with space group C2/c.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Esseneite 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.
Quick Facts
Physical Properties
- Color
- red-brown
- Hardness (Mohs)
- 6
- Rock tumbling
- With care
- Density
- 3.54 g/cm³
- Streak
- white
Chemical Properties
- Chemical Formula
- CaFe3+[AlSiO6]
- Elements
- Al, Ca, Fe, O, Si
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Esseneite FAQs
How do I identify Esseneite?
Esseneite can be identified by its hardness of 6 on the Mohs scale, red-brown color. Look for these key characteristics when examining specimens.
What color is Esseneite?
Esseneite typically appears in red-brown. Color can vary depending on impurities and formation conditions.
How hard is Esseneite?
Esseneite has a hardness of 6 on the Mohs scale. This gives it moderate hardness.
