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Pezzottaite

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Formula:
Cs(Be2Li)Al2(Si6O18)
System:
Trigonal
Colour:
raspberry red to pink
Hardness:
8
Member of:
Name:
For Dr. Federico Pezzotta of the Museo Civico, Milano, Italy.
Related to beryl. Pezzottaite is trigonal while beryl is hexagonal.

Visit gemdat.org for gemological information about Pezzottaite.

Classification of Pezzottaite

Approved 2003
9.CJ.60

9 : SILICATES (Germanates)
C : Cyclosilicates
J : [Si6O18]12- 6-membered single rings (sechser-Einfachringe), without insular complex anions
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http://www.mindat.org/min-25652.html
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Type Occurrence of Pezzottaite

Place of Conservation of Type Material:
Smithsonian, Canadian Museum of Nature, Ottawa, ontario Canada, Natural History Museum of Bern, Switzerland
Year of Discovery:
2002
Geological Setting of Type Material:
Pegmatite

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)

Crystallography of Pezzottaite

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

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

Formula:
Cs(Be2Li)Al2(Si6O18)
Essential elements:
All elements listed in formula:

Relationship of Pezzottaite to other Species

Member of:
Other Members of Group:
BazziteBe3Sc2(Si6O18)
BerylBe3Al2(Si6O18)
StoppaniiteBe3Fe23+(Si6O18) · H2O
9.CJ.05BazziteBe3Sc2(Si6O18)
9.CJ.05BerylBe3Al2(Si6O18)
9.CJ.05IndialiteMg2Al3(AlSi5O18)
9.CJ.05StoppaniiteBe3Fe23+(Si6O18) · H2O
9.CJ.10Cordierite(Mg,Fe)2Al3(AlSi5O18)
9.CJ.10Sekaninaite(Fe,Mg)2Al3(AlSi5O18)
9.CJ.15aCombeiteNa2Ca2(Si6O18)0.5
9.CJ.15bImandriteNa12Ca3Fe23+(Si6O18)2
9.CJ.15aKazakoviteNa6Mn2+Ti(Si6O18)
9.CJ.15cKoashviteNa6(Ca,Mn)(Ti,Fe)Si6O18 · H2O
9.CJ.15aLovozeriteNa2Ca(Zr,Ti)(Si6O12)[(OH)4O2] · H2O
9.CJ.15aTisinaliteNa3H3(Mn,Ca,Fe)TiSi6(O,OH)18 · 2H2O
9.CJ.15aZirsinaliteNa6(Ca,Mn2+,Fe2+)Zr(Si6O18)
9.CJ.15aLitvinskiteNa2(◻,Na,Mn)ZrSi6O12(OH,O)6
9.CJ.15aKapustiniteNa5(Na,Mn2+)<1Zr(H2Si6O18)
9.CJ.25BaratoviteKCa7(Ti,Zr)2Li3Si12O36F2
9.CJ.25KatayamaliteKLi3Ca7Ti2(SiO3)12(OH)2
9.CJ.25AleksandroviteKCa7Sn2Li3Si12O36F2
9.CJ.30DioptaseCuSiO3 · H2O
9.CJ.35KostyleviteK2Zr(Si3O9) · H2O
9.CJ.40PetarasiteNa5Zr2(Si6O18)(Cl,OH) · 2H2O
9.CJ.45Gerenite-(Y)(Ca,Na)2(Y,REE)3Si6O18 · 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, Brendan M., William B. (Skip) Simmons, George R. Rossman, Elizabeth P. Quinn, Shane F. McClure, Adolf Peretti, Thomas Armbruster, Frank C. Hawthorne, Alexander U. Falster, Detlef Günther, Mark A. Cooper, and Bernard Grobéty (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., 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.

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.

Yakubovich, O.V., I.V. Pekov, I.M.Steele, W.Massa, & N.V.Chukanov (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. [Kristallografiya 54,432-445 (2009)]

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.

Internet Links for Pezzottaite

Specimens:
The following Pezzottaite specimens are currently listed for sale on minfind.com.

Localities for Pezzottaite

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 (TL)
 
  • 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.
Mineral and/or Locality  
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