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Peprossiite-(Ce)

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About Peprossiite-(Ce)Hide

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 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.


Classification of Peprossiite-(Ce)Hide

Approved
Approval Year:
1990
First Published:
1993
6.CA.45

6 : BORATES
C : Triborates
A : Neso-triborates
24.3.4.1

24 : ANHYDROUS BORATES
3 : AmBn[XO3]p

Physical Properties of Peprossiite-(Ce)Hide

Vitreous
Transparency:
Transparent, Translucent
Colour:
Light yellow; colourless in transmitted light
Streak:
White
Hardness:
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.
Density:
3.45 g/cm3 (Measured)    3.476 g/cm3 (Calculated)

Optical Data of Peprossiite-(Ce)Hide

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.
Surface Relief:
High

Chemical Properties of Peprossiite-(Ce)Hide

Formula:
(Ce,La)(Al3O)2/3B4O10
IMA Formula:
(Ce,La)(Al3O)2/3B4O10

Crystallography of Peprossiite-(Ce)Hide

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.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
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 )

Geological EnvironmentHide

Paragenetic Mode(s):
•  Ejecta

Type Occurrence of Peprossiite-(Ce)Hide

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.
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)Hide

Other Language Names for Peprossiite-(Ce)Hide

Related Minerals - Nickel-Strunz GroupingHide

6.CA.10AmeghiniteNa(H4B3O7)Mon.
6.CA.15InderiteMgB3O3(OH)5 · 5H2OMon. 2/m : P21/b
6.CA.20KurnakoviteMgB3O3(OH)5 · 5H2OTric. 1 : P1
6.CA.25InderboriteCaMg(H3B3O7)2 · 8H2OMon. 2/m
6.CA.30MeyerhofferiteCa2(H3B3O7)2 · 4H2OTric. 1 : P1
6.CA.35InyoiteCa(H4B3O7)(OH) · 4H2OMon. 2/m
6.CA.40SolongoiteCa2(H3B3O7)(OH)ClMon.
6.CA.50NifontoviteCa3B6O6(OH)12(H2O)2Mon.
6.CA.55OlshanskyiteCa2[B3O3(OH)6](OH) · 3H2OTric.

Other InformationHide

Health Risks:
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)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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)Hide

Localities for Peprossiite-(Ce)Hide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Italy (TL)
 
  • Lazio
    • Metropolitan City of Rome Capital
      • 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
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
Calvario, F., Carloni, L., Fiori, S., Pucci, R. (1993) Nuovi ritrovamenti mineralogici nel Lazio. Il Cercapietre, 20, 31-34; Bellatreccia, F. (1994) Minerali di Terre Rare nel Lazio. Il Cercapietre, 21, 11-19; Callegari, A., Caucia, F., Mazzi, F., Oberti, R., Ottolini, L., 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, 586-593; Pucci, R., Lucci, F., Corsaletti, M., Fiori, S., Signoretti, E. (2015) Le tormaline del "Vicano" - 2a parte. Il Cercapietre, 22-56; http://www.gminromano.it/Cercapietre/rivista15/CP2015.pdf
 
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