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.

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.

Oneillite Market Value Calculator

Estimate the market value of Oneillite using size, quality, and finish. This preview calculator is for quick context and is not a formal appraisal.

Oneillite Localities Map

See where Oneillite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.

Map preview

North ZoneCentral RidgeSouth Basin

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.