Oneillite is a rare mineral of the eudialyte group with the chemical formula Na15Ca3Mn3Fe2+3Zr3NbSiO(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.
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| - Oneil·lita (ca)
- Oneillita (eu)
- Oneillite (it)
- Oneillite (en)
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| - L'oneil·lita és un mineral de la classe dels silicats, que pertany al . Rep el nom per John Johnston O'Neill (1886-1966), geòleg del Servei Geològic del Canadà, i posteriorment professor de geologia, degà de ciències i degà d'enginyeria a la Universitat McGill de Mont-real, Canadà. (ca)
- Oneillita silikato motako minerala da eta eudialyte taldearen kidea da. (eu)
- Oneillite is a rare mineral of the eudialyte group with the chemical formula Na15Ca3Mn3Fe2+3Zr3NbSiO(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. (en)
- La oneillite è un minerale appartenente al gruppo dell'eudialite. (it)
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streak
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strunz
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unit cell
| - a = 14.19, c = 29.98 [Å], Z = 3 (en)
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| - L'oneil·lita és un mineral de la classe dels silicats, que pertany al . Rep el nom per John Johnston O'Neill (1886-1966), geòleg del Servei Geològic del Canadà, i posteriorment professor de geologia, degà de ciències i degà d'enginyeria a la Universitat McGill de Mont-real, Canadà. (ca)
- Oneillita silikato motako minerala da eta eudialyte taldearen kidea da. (eu)
- Oneillite is a rare mineral of the eudialyte group with the chemical formula Na15Ca3Mn3Fe2+3Zr3NbSiO(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. (en)
- La oneillite è un minerale appartenente al gruppo dell'eudialite. (it)
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diaphaneity
| - Transparent or translucent (en)
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