IMA mineral species

Oneillite

Na₁₅Ca₃Mn₃Fe²⁺₃Zr₃Nb(Si₂₅O₇₃)(O,OH,H₂O)₃(OH,Cl)₂

Cyclosilicate mineral.

YellowBrown

Properties

🔷 Trigonal✏️ streak white
Chemical formulaNa₁₅Ca₃Mn₃Fe²⁺₃Zr₃Nb(Si₂₅O₇₃)(O,OH,H₂O)₃(OH,Cl)₂
ElementsNa, Ca, Mn, Fe, Zr, Nb, Si, O, H, Cl
Crystal systemTrigonal
Mohs hardness—
Density—
Streakwhite
Color—
IMA symbolOne
Nickel–Strunz class9.CO.10

“—” means no reliable value in Wikidata yet. Check Mindat for full data.

🌍 Where it's found

Type locality (where it was first described): Poudrette quarry, Canada

  • Type locality
  • Notable source / deposit
  • Country of origin

Marker positions are approximate (region or locality level). Type localities from Wikidata; notable sources curated by Crystopedia.