Mindat Logo

Peprossiite-(Ce)

This page is currently not sponsored. Click here to sponsor this page.



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
mindat.org URL:http://www.mindat.org/min-3157.html
Please feel free to link to this page.

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
Simplified for copy/paste:(Ce,La)(Al3O)2/3B4O10
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
MgB
 
3
O
 
3
(OH)
 
5
· 5H
 
2
O
6.CA.20Kurnakovite
MgB
 
3
O
 
3
(OH)
 
5
· 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)

Search Engines:
  • Look for Peprossiite-(Ce) on Google
  • Look for Peprossiite-(Ce) images on Google
  • External Links:
  • Look for Peprossiite-(Ce) on Webmineral
  • Look for Peprossiite-(Ce) on Athena Mineralogy
  • Look for Peprossiite-(Ce) on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Peprossiite-(Ce) details from Handbook of Mineralogy (PDF)
  • Mineral Dealers:
  • Mineral Classics - Worldwide Collector Quality Minerals and Gems
  • Fine and rare minerals from mintreasure.com
  • Buy from McDougall Minerals
  • Lapis Mineral Magazin
  • Find Peprossiite-(Ce) on www.crystalclassics.co.uk
  • Rare and Unusual minerals at Mineralogical Research Company
  • Fabre Minerals - search for Peprossiite-(Ce) specimens
  • Search for Peprossiite-(Ce) on Well-Arranged Molecules
  • Buy RARE Minerals from Rocks of Africa
  • Fine minerals from bisbeeborn.com
  • The Arkenstone - Fine Minerals
  • SpiriferMinerals.com - high quality low prices
  • Localities for Peprossiite-(Ce)

    (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
    Mineral and/or Locality  
    Search Google  
    Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
    Current server date and time: June 1, 2014 22:41:52
    Mineral and Locality Search
    Mineral:
    and/or Locality:
    Options
    Fade toolbar when not in focusFix toolbar to bottom of page
    Hide Social Media Links
    Slideshow frame delay seconds