Perrierite-(La)

(La,Ce,Ca)4(Fe2+,Mn)(Ti,Fe3+,Al)4[(Si2O7)O4]2
IMA status
  • Approved
IMA symbol
Prr-La
IMA approved
2011
Also known as
  • IMA2010-089
  • Perrieriet-(La)

Where it forms, where it's found

Geological setting

In sanidinite

Type locality
In den Dellen quarries
  1. Mendig
  2. Mendig
  3. Mayen-Koblenz
  4. Rhineland-Palatinate
  5. Germany

50.3929°, 7.2845°

5recorded occurrences
Source · OpenStreetMap

Physical

Hardness
123456789106/ 10 MOHS
  1. 1Talc
  2. 2Gypsum
  3. 3Calcite
  4. 4Fluorite
  5. 5Apatite
  6. 6Orthoclase
  7. 7Quartz
  8. 8Topaz
  9. 9Corundum
  10. 10Diamond
Colour
Black
Streak
Brown
Tenacity
brittle
Cleavage
Distinct/Good

Distinct cleavage on (001).

Crystallography

Crystal system
Monoclinic
Space group
P21/a
Cell parameters
a = 13.668(1) Å · b = 5.6601(6) Å · c = 11.743(1) Å
Cell angles
β = 113.64(1) °
Ratio a:b:c
1 : 0.414 : 0.859
Unit cell volume
832.2 ų
Z
2
Morphology

Eifel material: isolated prismatic crystals up to 0.5 x 1 mm in size. Norwegian material: Single crystals to 7mm (metamict).

Type-locality form

Iolated prismatic crystals up to 0.5 x 1 mm in size.

Comment

Norwegian material: a = 13.7, b = 5.66, c = 11.83 A, beta = ?.

Crystal structure

Chemical composition

Constituent elements
Mass composition breakdown
ElementAtoms At. mass g/mol Mass g/molMass share
58CeCeriumCerium4140.116560.464
23.61%
57LaLanthanumLanthanum4138.905555.620
23.40%
8OOxygenOxygen2215.999351.978
14.83%
26FeIronIron555.845279.225
11.76%
22TiTitaniumTitanium447.867191.468
8.06%
20CaCalciumCalcium440.078160.312
6.75%
14SiSiliconSilicon428.085112.340
4.73%
13AlAluminiumAluminium426.982107.928
4.55%
25MnManganeseManganese154.93854.938
2.31%
Total2374.273100.00%

Mass share = atoms × atomic mass ÷ molar mass × 100

From IMA formula

Synonyms

  • IMA2010-089
  • Perrieriet-(La)

In other languages

French
perriérite-(La)
German
IMA 2010-089 · Perrierit-(La)
Italian
perrierite-(La)

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-(La)Species

Group, growth & confusion

In the same group
5 members
Commonly confused with
1 mineral

Literature, links & citation

Citations
  1. 1974Calvo, Crispin, Faggiani, and R. (1974) A re-investigation of the crystal structures of chevkinite and perrierite. American Mineralogist, 59 (11-12) 1277-1285
  2. 1978Segalstad, Tom Victor, Larsen, Alf Olav (1978) Chevkinite and perrierite from the Oslo region, Norway. American Mineralogist, 63 (5-6) 499-505
  3. 2011Williams, P. A., Hatert, F., Pasero, M., Mills, S. J. (2011) New minerals and nomenclature modifications approved in 2011. CNMNC Newsletter No 9. Mineralogical Magazine, 75 (4) 2535-2540 doi:10.1180/minmag.2011.075.4.2535 DOI: 10.1180/minmag.2011.075.4.2535
  4. 2012Chukanov, N. V., Blass, G., Pekov, I. V., Belakovskiy, D. I., Van, K. V., Rastsvetaeva, R. K., Aksenov, S. M. (2012) Perrierite-(La), (La,Ce,Ca)4(Fe2+,Mn)(Ti,Fe3+,Al)4(Si2O7)2O8, a new mineral species from the Eifel volcanic district, Germany. Geology of Ore Deposits, 54 (8) 647-655 doi:10.1134/s1075701512080053DOI: 10.1134/s1075701512080053
  5. 2013(2013) Perrierite-(La). Handbook of Mineralogy. Mineralogical Society of America
Cite this entry
@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Perrierite-(La) — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/perrierite-la-29144},
  note      = {Accessed 2026-05-11}
}