Ottrelite
A variety of Minerals
What is Ottrelite?
Ottrelite is a form of chloritoid. Its empirical formula is (Mn,Fe,Mg)2Al4Si2O10(OH)4.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Ottrelite 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
- Pistachio-green, greenish to dark grey
- Hardness (Mohs)
- 6 - 7
- Rock tumbling
- With care
- Streak
- Greenish, greyish
Chemical Properties
- Chemical Formula
- (Mn2+,Fe2+,Mg)Al2(SiO4)O(OH)2
- Elements
- Al, Fe, H, Mg, Mn, O, Si
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Ottrelite FAQs
How do I identify Ottrelite?
Ottrelite can be identified by its hardness of 6 - 7 on the Mohs scale, Pistachio-green color. Look for these key characteristics when examining specimens.
What color is Ottrelite?
Ottrelite typically appears in Pistachio-green, greenish to dark grey. Color can vary depending on impurities and formation conditions.
How hard is Ottrelite?
Ottrelite has a hardness of 6 - 7 on the Mohs scale. This gives it moderate hardness.
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