Where it forms, where it's found
- Type locality
- Nettuno seashore
- Nettuno
- Metropolitan City of Rome Capital
- Lazio
- Italy
46recorded occurrences
Physical
Optical
- Optical type
- Biaxial (-) · 2V measured = 60° · 2V calc = 32 – 82°
- Refractive index
- 1.9 – 2.06
- Surface relief
- Very high
- Principal indices
- nα 1.9 – 1.95 · nβ 2.01 · nγ 2.02 – 2.06
- Dispersion
- r > v strong
Δ = 0Δmax
PPLpleochroism per grain
XPLindependent extinctions · rotate the stage
PPLpleochroism only · colour blends on rotation
XPLinterference colour · extinct every 90°
Retardation1150 nm
Order3rd order
XPL colour
Crystallography
- Space group
- P21/a
- Cell parameters
- a = 13.60 Å · b = 5.615 Å · c = 11.68 Å
- Cell angles
- β = 113.6 °
- Ratio a:b:c
- 1 : 0.413 : 0.859
- Z
- 2
- Comment
Range observed: a = 13.59-13.61, b = 5.61-5.62, c = 11.63-11.73 Å, β = 113.28-113.95°.
Crystal structure
Chemical composition
Synonyms
- Perrieriet-(Ce)
- Perrierit
- Perrierita
In other languages
- French
- perriérite-(Ce)
- German
- Perrierit-(Ce)
- Italian
- Perrierite- · Perrierite-(Ce)
Classification
Strunz
10th ed.9.BE.70
- 9SilicatesClass
- 9.BSorosilicatesDivision
- 9.BESi2O7 groups, with additional anions; cations in octahedral [6] and greater coordinationGroup
- 9.BE.70Perrierite-(Ce)Species
Dana
8th ed.56.02.08.03
- 56Sorosilicates Si2o7 Groups, with Additional O, Oh, F and H2oClass
- 56.02Si2O7 Groups and O, OH, F, and H2O with cations in [4] and/or >[4] coordinationType
- 56.02.08Perierite - Chevkinite groupGroup
- 56.02.08.03Perrierite-(Ce)Species
CIM
—14.9.22
- 14Silicates not Containing AluminumClass
- 14.9Silicates of TiGroup
- 14.9.22Perrierite-(Ce)Species
Group, growth & confusion
Literature, links & citation
Citations
- 1950Bonatti, S., Gottardi, G. (1950) Perrierite, nuovo minerale ritrovato nella sabbia di Nettuno (Roma). Atti della Reale Accademia dei Lincei, Rendiconti della Classe di Scienze Fisiche, Matematiche e Naturali: 9: 361-368.
- 1951Fleischer, M. (1951) New mineral names. American Mineralogist, 36 (11-12). 925-928
- 1954Bonatti, S., and Gottardi, G. (1954) Nuovi dati sulla perrierite. Relazioni tra perrierite, chevkinite ed epidoti. Rendiconti della Società Mineralogica Italiana, 10, 208-225
- 1959Bonatti, Stefano (1959) Chevkinite, perrierite and epidotes. American Mineralogist, 44 (1-2) 115-137
- 1966Bonatti, S., Gottardi, G. (1966) Un caso di polimorfismo a strati in sorosilicati: perrierite e chevkinite. Periodico di Mineralogia – Roma: 69-91.
Cite this entry
@misc{mineral2026,
author = {Mineral Index editorial board},
title = {Perrierite-(Ce) — Mineral Index},
year = {2026},
url = {https://mineralindex.org/minerals/perrierite-ce-3168},
note = {Accessed 2026-05-11}
}