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Peprossiite-(Ce)

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Capranica, Vico Lake, Viterbo Province, Latium, Italy
© Antonio Borrelli

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Formula:
(Ce,La)(Al
 
3
O)
 
2/3
B
 
4
O
 
10
System:HexagonalColour:Light yellow; colourless ...
Hardness:2
Name:After Giuseppe "Pep" Rossi (1938-1990), Italian mineralogist and crystallographer.


The first anhydrous rare-earth-element borate.

Classification of Peprossiite-(Ce)

IMA status:Approved 1999
Strunz 8th edition ID:5/K.11-10
Nickel-Strunz 10th (pending) edition ID:6.CA.45

6 : BORATES
C : Triborates
A : Neso-triborates
Dana 8th edition ID:24.3.4.1

24 : ANHYDROUS BORATES
3 : AmBn[XO3]p
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Type Occurrence of Peprossiite-(Ce)

Type Locality:Sacrofano, Sacrofano Caldera, Rome Province, Latium, Italy
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. and: Museum National d'Histoire Nazturelle, paris, France.
Year of Discovery:1992
Geological Setting of type material:Sanidine volcanic ejectum within pyroclastics.
Associated Minerals at type locality:
Sanidine

Physical Properties of Peprossiite-(Ce)

Lustre:Vitreous
Diaphaneity (Transparency):Transparent, Translucent
Colour:Light yellow; colourless in transmitted light
Hardness (Mohs):2
Cleavage:Perfect
On {0001}, perfect; on {110} ({110} ?), distinct.
Density (measured):3.45 g/cm3
Density (calculated):3.476 g/cm3

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 Volume:V 172.23 ų (Calculated from Unit Cell)
Z:1
Morphology:Small flakes with a hexagonal outline.

Optical Data of Peprossiite-(Ce)

Type:Uniaxial (+)
RI values: nω = 1.703 nε = 1.711
Maximum Birefringence:δ = 0.008

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:High

Chemical Properties of Peprossiite-(Ce)

Formula:
(Ce,La)(Al
 
3
O)
 
2/3
B
 
4
O
 
10
Essential elements:Al, B, Ce, O
All elements listed in formula:Al, B, Ce, La, O

Relationship of Peprossiite-(Ce) to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
6.CA.10Ameghinite
Na(H
 
4
B
 
3
O
 
7
)
6.CA.15Inderite
Mg(H
 
4
B
 
3
O
 
7
)(OH) · 5H
 
2
O
6.CA.20Kurnakovite
Mg(H
 
4
B
 
3
O
 
7
)(OH) · 5H
 
2
O
6.CA.25Inderborite
CaMg(H
 
3
B
 
3
O
 
7
)
 
2
 · 8H
 
2
O
6.CA.30Meyerhofferite
Ca
 
2
(H
 
3
B
 
3
O
 
7
)
 
2
 · 4H
 
2
O
6.CA.35Inyoite
Ca(H
 
4
B
 
3
O
 
7
)(OH) · 4H
 
2
O
6.CA.40Solongoite
Ca
 
2
(H
 
3
B
 
3
O
 
7
)(OH)Cl
6.CA.50Nifontovite
Ca
 
3
B
 
6
O
 
6
(OH)
 
12
(H
 
2
O)
 
2
6.CA.55Olshanskyite
Ca
 
3
[B(OH)
 
4
]
 
4
(OH)
 
2

Other Names for Peprossiite-(Ce)

Synonyms:
IMA1990-002IMA1999-B
Other Languages:
German:Peprossiit-(Ce)
Russian:Пепроссит-(Ce)

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Peprossiite-(Ce)

Reference List:

- +
Della Ventura, G., Parodi, G.C., Mottana, A., and haussidon, M. (1993) Peprossiite-(Ce), a new mineral from Campagnano (Italy): the first anhydrous rare-earth-element borate. European Journal of Mineralogy: 5: 53-58.

Jambor, John L., and Jacek Puziewicz (1993) New Mineral Names. American Mineralogist: 78: 1109.

Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).

New Minerals (1997), New Minerals 1990-1994.

Callegari, A., Caucia, F., Mazzi, F., Oberti, R., Ottolini, L., and Ungaretti, L. (2000) The crystal structure of peprossiite-(Ce), an anhydrous REE and Al mica-like borate with square-pyramidal coordination for Al. American Mineralogist: 85: 586-592.

Internet Links for Peprossiite-(Ce)

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Peprossiite-(Ce) details from Handbook of Mineralogy (PDF)
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    • Localities for Peprossiite-(Ce)

    Hide Locality List
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Italy
     
    • Latium
      • Rome Province
        • Sacrofano Caldera
          • Campagnano di Roma
    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.
      • Viterbo Province
        • Vico Lake
    		Della Ventura, G., Bellatreccia, F., Caprilli, E., Rossi, P., Tamagnini, F., Fiori, S., 2004. Dieci anni di micromineralogia laziale. Il Cercapietre. Not. del Gruppo Mineralogico Romano, 1-2
    No reference listed
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