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Pezzottaite

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Federico Pezzotta
Formula:
CsLiBe2Al2Si6O18
System:
Trigonal
Colour:
raspberry red to pink
Lustre:
Vitreous
Hardness:
8
Member of:
Name:
Named by Brendan M. Laurs, et al. in 2003 in honor of Federico Pezzotta (28 October 1965, Bergamo, Italy - ), petrologist and curator at the Museo Civico, Milano, Italy, for his work on Madagascar's granitic pegmatites.
Related to beryl. Pezzottaite is trigonal while beryl is hexagonal.

Visit gemdat.org for gemological information about Pezzottaite.


Classification of Pezzottaite

Approved
Approval Year:
2003
9.CJ.60

9 : SILICATES (Germanates)
C : Cyclosilicates
J : [Si6O18]12- 6-membered single rings (sechser-Einfachringe), without insular complex anions

Physical Properties of Pezzottaite

Vitreous
Diaphaneity (Transparency):
Transparent, Translucent
Colour:
raspberry red to pink
Streak:
colorless to white
Hardness (Mohs):
8
Tenacity:
Brittle
Cleavage:
Imperfect/Fair
(001)
Parting:
none observed
Fracture:
Irregular/Uneven, Conchoidal
Density:
2.97 g/cm3 (Measured)    3.06 g/cm3 (Calculated)

Optical Data of Pezzottaite

Type:
Uniaxial (-)
RI values:
nω = 1.612 - 1.620 nε = 1.601 - 1.611
Max Birefringence:
δ = 0.011
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Pleochroism:
Strong
Comments:
orange-red to purple-violet

Chemical Properties of Pezzottaite

IMA Formula:
CsLiBe2Al2Si6O18
Elements listed in formula:

Crystallography of Pezzottaite

Crystal System:
Trigonal
Class (H-M):
3 - Rhombohedral
Space Group:
R3
Cell Parameters:
a = 15.946 Å, c = 27.803 Å
Ratio:
a:c = 1 : 1.744
Unit Cell Volume:
V 6122 ų
Z:
18
Morphology:
hexagonal tabular crystals, small flat to equant crystals

Type Occurrence of Pezzottaite

Place of Conservation of Type Material:
Smithsonian, Canadian Museum of Nature, Ottawa, ontario Canada, Natural History Museum of Bern, Switzerland
Geological Setting of Type Material:
Pegmatite

Relationship of Pezzottaite to other Species

Member of:
Other Members of Group:
BazziteBe3Sc2(Si6O18)
BerylBe3Al2(Si6O18)
StoppaniiteBe3Fe23+(Si6O18) · H2O
9.CJ.05BazziteBe3(Sc,Fe3+,Mg)2Si6O18 · Na0.32 · nH2O
9.CJ.05BerylBe3Al2Si6O18
9.CJ.05IndialiteMg2Al3(AlSi5)O18
9.CJ.05StoppaniiteFe23+Be3Si6O18 · H2O
9.CJ.10CordieriteMg2Al3(AlSi5)O18
9.CJ.10SekaninaiteFe22+Al3(AlSi5)O18
9.CJ.15aCombeiteNa2Ca2Si3O9
9.CJ.15bImandriteNa12Ca3Fe23+Si12O36
9.CJ.15aKazakoviteNa6Mn2+TiSi6O18
9.CJ.15cKoashviteNa6CaTiSi6O18
9.CJ.15aLovozeriteNa3CaZrSi6O15(OH)3
9.CJ.15aTisinaliteNa3Mn2+TiSi6O15(OH)3
9.CJ.15aZirsinaliteNa6CaZrSi6O18
9.CJ.15aLitvinskiteNa3ZrSi6O13(OH)5
9.CJ.15aKapustiniteNa6ZrSi6O16(OH)2
9.CJ.25BaratoviteKLi3Ca7Ti2(SiO3)12F2
9.CJ.25KatayamaliteKLi3Ca7Ti2(SiO3)12(OH)2
9.CJ.25AleksandroviteKLi3Ca7Sn2(SiO3)12F2
9.CJ.30DioptaseCuSiO3 · H2O
9.CJ.35KostyleviteK2ZrSi3O9 · H2O
9.CJ.40PetarasiteNa5Zr2Si6O18(Cl,OH) · 2H2O
9.CJ.45Gerenite-(Y)(Ca,Na)2Y3Si6O18 · 2H2O
9.CJ.50OdintsoviteK2Na4Ca3Ti2Be4Si12O38
9.CJ.55MathewrogersitePb7FeAl3GeSi12O36(OH,H2O)6

Other Names for Pezzottaite

Name in Other Languages:

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.

References for Pezzottaite

Reference List:
Laurs, B.M., Simmons, W.B., Rossman, G.R., Quinn, E.P., McClure, S.F., Peretti, A., Armbruster, T., Hawthorne, F.C., Falster, A.U., Günther, D., Cooper, M.A., Grobéty, B. (2003) Pezzottaite from Ambatovita, Madagascar: A New Gem Mineral. Gems & Gemology: 39(4): 284-301.

Hawthorne, F.C., Cooper, M.A., Simmons, W.B., Falster, A.U., Laurs, B.M., Armbruster, T., Rossman, G.R., Peretti, A., Günter, D., Grobéty, B. (2004) Pezzottaite Cs(Be2Li)Al2Si6O18 A spectacular new beryl-group mineral from the Sakavalana pegmatite, Fianarantsoa province, Madagascar. Mineralogical Record: 35(5): 369-378.

Beryl and its Color Varieties (2005) Extra Lapis English No. 7.

Pezzotta, F., Guastoni, A., Forner, H., Demartin, F., Kristiansen, R. (2005) Découverte exceptionnelle de chiavennite associée à pezzottaite dans la pegmatite de Sakavalana, Mandrosonoro, Madagascar. Le Règne Minéral: 61: ???-???.

Piilonen, P.C., Grew, E.S., Ercit, T.S. (2005) New mineral names. American Mineralogist: 90: 1227-1233.

Locock, A.J., Piilonen, P.C., Ercit, T.S., Rowe, R. (2006) New mineral names. American Mineralogist: 91: 216-224.

Devouard, B., Devidal, J.L. (2007) Pezzottaite from Myanmar. Gems & Gemology: Gem News International: 43(1): 70-72.

Yakubovich, O.V., Pekov, I.V., Steele, I.M., Massa, W., Chukanov, N.V. (2009) Alkali metals in beryl and their role in the formation of derivative structural motifs: comparative crystal chemistry of vorobyevite and pezzottaite. Crystallography Reports: 54: 399-412.

(2009) Kristallografiya: 54: 432-445.

Gatta, G.D., Adamo, I., Meven, M., Lambruschi, E. (2012) A single-crystal neutron and X-ray diffraction study of pezzottaite, Cs(Be2Li)Al2Si6O18. Physics and Chemistry of Minerals: 39: 829-840.

Skalwold, E.A., Koivula, J.I. (2015) Pezzottaite Debuts as the Newest Trapiche Gem Mineral. Gems & Gemology: 51(3): 326-328. [http://www.gia.edu/gems-gemology/fall-2015-microworld-pezzottaite-debuts-trapiche-gem-mineral]

Internet Links for Pezzottaite

mindat.org URL:
https://www.mindat.org/min-25652.html
Please feel free to link to this page.
Specimens:
The following Pezzottaite specimens are currently listed for sale on minfind.com.

Localities for Pezzottaite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
Afghanistan
 
  • Konar Province (Kunar Province; Konarh Province; Konarha Province; Nuristan)
    • Chapa Dara District
Herb Obodda
  • Nuristan Province (Nurestan Province; Nooristan Province; Nuristan)
    • Wama District (Vama District)
      • Parun (Paroon; Parown) pegmatite field
Lapis Extra (English) No. 7 (2005) p12
Madagascar
 
  • Antananarivo Province
    • Vakinankaratra Region
      • Sahatany Pegmatite Field (Mt Ibity area)
        • Sahatany Valley
Rob Lavinsky photo id 744080 ( Dr. Federico Pezzotta is cited in caption on the validity of the id)
  • Fianarantsoa Province
    • Amoron'i Mania Region
      • Ambatofinandrahana District
        • Mandrosonoro Commune
          • Ambatovita
Laurs, B. L. et al. (2003): Pezzottaite from Ambatovita, Madagaascar: A new Gem mineral. Gems & Gemology 39 (4): 284-301; Hawthorne, F.C., Cooper, M.A., Simmons, W.B., Falster, A.U., Laurs, B.M., Armbruster, T., Rossman, G.R., Peretti, A., Günter, D., and Grobéty, B. (2004) Pezzottaite Cs(Be2Li)Al2Si6O18 A spectacular new beryl-group mineral from the Sakavalana pegmatite, Fianarantsoa province, Madagascar. Mineralogical Record: 35(5): 369-378; G. Diego Gatta, Ilaria Adamo, Martin Meven, Erica Lambruschi (2012): A single-crystal neutron and X-ray diffraction study of pezzottaite, Cs(Be2Li)Al2Si6O18. Physics and Chemistry of Minerals 39, 829-840.
Myanmar
 
  • Shan State
    • Kyaukme District
      • Momeik Township
        • Molo quarter
Devouard, B. and Devidal, J.L. (2007): Pezzottaite from Myanmar. Gems & Gemology: Gem News International, 43(1), 70-72.
Mineral and/or Locality  
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