Peprossiite-(Ce)
A valid IMA mineral species
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About Peprossiite-(Ce)
Formula:
(Ce,La)(Al3O)2/3B4O10
Colour:
Light yellow; colourless in transmitted light
Lustre:
Vitreous
Hardness:
2
Specific Gravity:
3.45
Crystal System:
Hexagonal
Name:
Named in honor of Giuseppe "Pep" Rossi (1938-1990), 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 the Italian mineral collector, Mr. Giorgio Penco in 1986.
Peprossiite-(Ce) was first found by the Italian mineral collector, Mr. Giorgio Penco in 1986.
Unique Identifiers
Mindat ID:
3157
Long-form identifier:
mindat:1:1:3157:4
GUID
(UUID V4):
(UUID V4):
0f0ba538-ba3d-4e4c-a93d-67e5b87acd53
IMA Classification of Peprossiite-(Ce)
Approved
IMA status notes:
Redefined by the IMA
IMA Formula:
(Ce,La)(Al3O)2/3B4O10
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 |
---|---|---|
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
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
High
Chemistry of Peprossiite-(Ce)
Mindat Formula:
(Ce,La)(Al3O)2/3B4O10
Crystallography of Peprossiite-(Ce)
Crystal System:
Hexagonal
Class (H-M):
6 m2 - 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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Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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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) |
---|---|---|---|---|---|---|---|
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 | ||
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 |
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:
Reference:
Della Ventura, G., Parodi, G.C., Mottana, A., and Chaussidon, M. (1993) Peprossiite-(Ce), a new mineral from Campagnano (Italy): the first anhydrous rare-earth-element borate. European Journal of Mineralogy: 5: 53-58
Synonyms of Peprossiite-(Ce)
Other Language Names for Peprossiite-(Ce)
German:Peprossiit-(Ce)
Russian:Пепроссит-(Ce)
Common Associates
Associated Minerals Based on Photo Data:
1 photo of Peprossiite-(Ce) associated with Pyrochlore Group | A2Nb2(O,OH)6Z |
1 photo of Peprossiite-(Ce) associated with Zirconolite | CaZrTi2O7 |
1 photo of Peprossiite-(Ce) associated with Titanite | CaTi(SiO4)O |
1 photo of Peprossiite-(Ce) associated with Fluorophlogopite | KMg3(Si3Al)O10F2 |
1 photo of Peprossiite-(Ce) associated with Sanidine | K(AlSi3O8) |
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.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)
Localities for Peprossiite-(Ce)
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).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Italy (TL) | |
| Della Ventura et al. (1993) |
| Della Ventura |
www.gminromano.it (n.d.) +4 other references | |
| Carlini et al. (2017) |
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Capranica, Viterbo Province, Lazio, Italy