Oneillite
A variety of Minerals
What is Oneillite?
Oneillite is a rare mineral of the eudialyte group with the formula Na15Ca3Mn3Fe3Zr3NbSiO(Si3O9)2(Si9O27)2(O,OH,H2O)3(OH,Cl)2. The formula is based on the original one but extended to show the presence of cyclic silicate groups and domination of Si at the M4 site. The mineral has lowered symmetry (space group R3, instead of more specific for the group R3m one) due to Ca-Mn ordering. Similar feature is displayed by some other eudialyte-group members: aqualite, labyrinthite, raslakite, and voronkovite. Oneillite is strongly enriched in rare earth elements (REE, mainly cerium), but REE do not dominate any of its sites.
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Oneillite 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.
Oneillite Localities Map
See where Oneillite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
Key Characteristics
Formation of Oneillite
Oneillite is one of four eudialyte-group minerals discovered within alkaline rocks of Mont Saint-Hilaire, Quebec, Canada. It associates with aegirine, albite, sodalite, and pyrite.
Quick Facts
Physical Properties
- Color
- Yellowish brown
- Hardness (Mohs)
- 5 - 6
Chemical Properties
- Chemical Formula
- Na15Ca3Mn3Fe2+3Zr3Nb(Si25O73)(O,OH,H2O)3(OH,Cl)2
- Elements
- Ca, Cl, Fe, H, Mn, Na, Nb, O, Si, Zr
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Oneillite FAQs
How do I identify Oneillite?
Oneillite can be identified by its hardness of 5 - 6 on the Mohs scale, Yellowish brown color. Look for these key characteristics when examining specimens.
What color is Oneillite?
Oneillite typically appears in Yellowish brown. Color can vary depending on impurities and formation conditions.
How hard is Oneillite?
Oneillite has a hardness of 5 - 6 on the Mohs scale. This gives it moderate hardness.
What is the formation of oneillite of Oneillite?
Oneillite is one of four eudialyte-group minerals discovered within alkaline rocks of Mont Saint-Hilaire, Quebec, Canada. It associates with aegirine, albite, sodalite, and pyrite.
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