Peprossiite-(Ce)
A valid IMA mineral species
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About Peprossiite-(Ce)
Formula:
CeAl2(B3.67Si0.33)O10.67
Colour:
Light yellow; colourless in transmitted light
Lustre:
Vitreous
Hardness:
2
Specific Gravity:
3.45
Crystal System:
Hexagonal
Name:
Named in honour of Giuseppe "Pep" Rossi (1938, Brixen/Bressanone, South Tyrol, Italy - 17 January 1989), Italian mineralogist and crystallographer, University of Pavia, Pavia, Italy. The suffix follows the Levinson rule for minerals with essential REE, denoting predominant cerium.
The first anhydrous rare-earth-element borate. Formed in cavities in sanidine ejecta by circulation of pneumatolytic to hydrothermal fluids, probably above 350 °C.
Peprossiite-(Ce) was first found by Italian mineral collector Giorgio Penco in 1986.
Peprossiite-(Ce) was first found by Italian mineral collector Giorgio Penco in 1986.
Unique Identifiers
Mindat ID:
3157
Long-form identifier:
mindat:1:1:3157:4
Similar Names
| Peprossiite-(Y) | A valid IMA mineral species - pending publication | YAl2(B3.67Si0.33)O10.67 |
IMA Classification of Peprossiite-(Ce)
Approved
IMA status notes:
Redefined by the IMA
IMA Formula:
Ce3+Al2(B3.67Si0.33)O10.67
Approval year:
1990
First published:
1993
Approval history:
Redefined 99V: Callegari et al. (2000).
Classification of Peprossiite-(Ce)
6.CA.45
6 : BORATES
C : Triborates
A : Neso-triborates
6 : BORATES
C : Triborates
A : Neso-triborates
24.3.4.1
24 : ANHYDROUS BORATES
3 : AmBn[XO3]p
24 : ANHYDROUS BORATES
3 : AmBn[XO3]p
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Pep-Ce | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Peprossiite-(Ce)
Vitreous
Transparency:
Transparent, Translucent
Colour:
Light yellow; colourless in transmitted light
Streak:
White
Hardness:
2 on Mohs scale
Comment:
2 or slightly more, but it could not be determined exactly due to the small grain size
Cleavage:
Perfect
On {0001}, perfect; on {11.0} ({110} ?), distinct.
On {0001}, perfect; on {11.0} ({110} ?), distinct.
Density:
3.45 g/cm3 (Measured) 3.476 g/cm3 (Calculated)
Optical Data of Peprossiite-(Ce)
Type:
Uniaxial (+)
RI values:
nω = 1.703 nε = 1.711
Max. Birefringence:
δ = 0.008
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Moderate
Chemistry of Peprossiite-(Ce)
Mindat Formula:
CeAl2(B3.67Si0.33)O10.67
Element Weights:
Crystallography of Peprossiite-(Ce)
Crystal System:
Hexagonal
Class (H-M):
6m2 - Ditrigonal Dipyramidal
Space Group:
P62m
Cell Parameters:
a = 4.61(1) Å, c = 9.358(7) Å
Ratio:
a:c = 1 : 2.03
Unit Cell V:
172.23 ų (Calculated from Unit Cell)
Z:
1
Morphology:
Small flakes with a hexagonal outline.
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0002425 | Peprossiite-(Ce) | Callegari A, Caucia F, Mazzi F, Oberti R, Ottolini L, Ungaretti L (2000) The crystal structure of peprossiite-(Ce), and anhydrous REE and Al mica-like borate with square-pyramidal coordination for Al American Mineralogist 85 586-593 |  | 2000 | 0 | 293 | |
| 0002424 | Peprossiite-(Ce) | Callegari A, Caucia F, Mazzi F, Oberti R, Ottolini L, Ungaretti L (2000) The crystal structure of peprossiite-(Ce), and anhydrous REE and Al mica-like borate with square-pyramidal coordination for Al American Mineralogist 85 586-593 | | 2000 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.67 Å | (100) |
| 3.04 Å | (100) |
| 2.458 Å | (75) |
| 2.308 Å | (50) |
| 2.020 Å | (50) |
| 1.953 Å | (50) |
| 1.855 Å | (50) |
| 1.835 Å | (50 ) |
Type Occurrence of Peprossiite-(Ce)
General Appearance of Type Material:
Light yellow flakes in vugs among sanidine crystals.
Place of Conservation of Type Material:
Museo di Mineralogia, University of Rome, Rome, Italy.
Museum National d'Histoire Nazturelle, Paris, France.
Museum National d'Histoire Nazturelle, Paris, France.
Geological Setting of Type Material:
Sanidine volcanic ejectum within pyroclastics.
Associated Minerals at Type Locality:
Synonyms of Peprossiite-(Ce)
Other Language Names for Peprossiite-(Ce)
Common Associates
Associations Based on Photo Data:
| 2 photos of Peprossiite-(Ce) associated with Sanidine | K(AlSi3O8) |
| 1 photo of Peprossiite-(Ce) associated with 'Biotitite' | |
| 1 photo of Peprossiite-(Ce) associated with Cancrinite Group | |
| 1 photo of Peprossiite-(Ce) associated with Zirconolite | CaZrTi2O7 |
| 1 photo of Peprossiite-(Ce) associated with Titanite | CaTiO(SiO4) |
| 1 photo of Peprossiite-(Ce) associated with Fluorophlogopite | KMg3(Si3Al)O10F2 |
| 1 photo of Peprossiite-(Ce) associated with Pyrochlore Group | A2Nb2(O,OH)6Z |
Related Minerals - Strunz-mindat Grouping
| 6.CA.10 | Ameghinite | Na(H4B3O7) |
| 6.CA.15 | Inderite | MgB3O3(OH)5 · 5H2O |
| 6.CA.20 | Kurnakovite | MgB3O3(OH)5 · 5H2O |
| 6.CA.25 | Inderborite | CaMg(H3B3O7)2 · 8H2O |
| 6.CA.30 | Meyerhofferite | CaB3O3(OH)5 · H2O |
| 6.CA.35 | Inyoite | Ca(H4B3O7)(OH) · 4H2O |
| 6.CA.40 | Solongoite | Ca2(H3B3O7)(OH)Cl |
| 6.CA.45 | Peprossiite-(Y) | YAl2(B3.67Si0.33)O10.67 |
| 6.CA.50 | Nifontovite | Ca3B6O6(OH)12(H2O)2 |
| 6.CA.55 | Olshanskyite | Ca2[B3O3(OH)6](OH) · 3H2O |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Peprossiite-(Ce)
mindat.org URL:
https://www.mindat.org/min-3157.html
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References for Peprossiite-(Ce)
Reference List:
Ventura, Giancarlo Della, Parodi, Gian Carlo, Mottana, Annibale, Chaussidon, Marc (1993) Peprossiite-(Ce), a new mineral from Campagnano (Italy): the first anhydrous rare-earth-element borate. European Journal of Mineralogy, 5 (1) 53-58 doi:10.1127/ejm/5/1/0053
Jambor, John L., Puziewicz, Jacek (1993) New Mineral Names. American Mineralogist, 78 (9-10) 1108-1112 p.1109
Ventura, Giancarlo Della, Parodi, Gian Carlo, Mottana, Annibale, Chaussidon, Marc (1993) Peprossiite-(Ce), a new mineral from Campagnano (Italy): the first anhydrous rare-earth-element borate. European Journal of Mineralogy, 5 (1) 53-58 doi:10.1127/ejm/5/1/0053
Callegari, Athos, Caucia, Franca, Mazzi, Fiorenzo, Oberti, Roberta, Ottolini, Luisa, Ungaretti, Luciano (2000) The crystal structure of peprossiite-(Ce), an anhydrous REE and Al mica-like borate with square-pyramidal coordination for Al. American Mineralogist, 85 (3). 586-593 doi:10.2138/am-2000-0421
Localities for Peprossiite-(Ce)
Showing 5 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Italy (TL) | |
| Ventura et al. (1993) |
| Della Ventura |
| www.gminromano.it (n.d.) +4 other references | |
| Carlini et al. (2017) |
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Monte Cavalluccio, Campagnano di Roma, Metropolitan City of Rome Capital, Lazio, Italy